71320617769 has 4 divisors (see below), whose sum is σ = 75515948244. Its totient is φ = 67125287296.

The previous prime is 71320617757. The next prime is 71320617773. The reversal of 71320617769 is 96771602317.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66364457769 + 4956160000 = 257613^2 + 70400^2 .

It is a cyclic number.

It is not a de Polignac number, because 71320617769 - 2⁹ = 71320617257 is a prime.

It is a super-2 number, since 2×71320617769² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71320617169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097665212 + ... + 2097665245.

It is an arithmetic number, because the mean of its divisors is an integer number (18878987061).

Almost surely, 2^71320617769 is an apocalyptic number.

It is an amenable number.

71320617769 is a deficient number, since it is larger than the sum of its proper divisors (4195330475).

71320617769 is a wasteful number, since it uses less digits than its factorization.

71320617769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195330474.

The product of its (nonzero) digits is 666792, while the sum is 49.

The spelling of 71320617769 in words is "seventy-one billion, three hundred twenty million, six hundred seventeen thousand, seven hundred sixty-nine".