71857771969 has 3 divisors (see below), whose sum is σ = 71858040033. Its totient is φ = 71857503906.

The previous prime is 71857771927. The next prime is 71857772009. The reversal of 71857771969 is 96917775817.

The square root of 71857771969 is 268063.

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 is not a de Polignac number, because 71857771969 - 2⁷ = 71857771841 is a prime.

It is a super-3 number, since 3×71857771969³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71857771169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 134032 + ... + 402094.

It is an arithmetic number, because the mean of its divisors is an integer number (23952680011).

Almost surely, 2^71857771969 is an apocalyptic number.

71857771969 is the 268063-rd square number.

71857771969 is the 134032-nd centered octagonal number.

It is an amenable number.

71857771969 is a deficient number, since it is larger than the sum of its proper divisors (268064).

71857771969 is an frugal number, since it uses more digits than its factorization.

71857771969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536126 (or 268063 counting only the distinct ones).

The product of its digits is 46675440, while the sum is 67.

The spelling of 71857771969 in words is "seventy-one billion, eight hundred fifty-seven million, seven hundred seventy-one thousand, nine hundred sixty-nine".