71805506758969 has 3 divisors (see below), whose sum is σ = 71805515232783. Its totient is φ = 71805498285156.

The previous prime is 71805506758943. The next prime is 71805506758981. The reversal of 71805506758969 is 96985760550817.

It is a happy number.

The square root of 71805506758969 is 8473813.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 61639535677225 + 10165971081744 = 7851085^2 + 3188412^2 .

It is not a de Polignac number, because 71805506758969 - 2⁷ = 71805506758841 is a prime.

It is a super-2 number, since 2×71805506758969² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71805506758895 and 71805506758904.

It is not an unprimeable number, because it can be changed into a prime (71805506758939) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4236907 + ... + 12710719.

It is an arithmetic number, because the mean of its divisors is an integer number (23935171744261).

Almost surely, 2^{71805506758969} is an apocalyptic number.

71805506758969 is the 8473813-rd square number.

71805506758969 is the 4236907-th centered octagonal number.

It is an amenable number.

71805506758969 is a deficient number, since it is larger than the sum of its proper divisors (8473814).

71805506758969 is an frugal number, since it uses more digits than its factorization.

71805506758969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16947626 (or 8473813 counting only the distinct ones).

The product of its (nonzero) digits is 1143072000, while the sum is 76.

The spelling of 71805506758969 in words is "seventy-one trillion, eight hundred five billion, five hundred six million, seven hundred fifty-eight thousand, nine hundred sixty-nine".