77952516931 has 4 divisors (see below), whose sum is σ = 82055281000. Its totient is φ = 73849752864.

The previous prime is 77952516923. The next prime is 77952516947. The reversal of 77952516931 is 13961525977.

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

It is a cyclic number.

It is not a de Polignac number, because 77952516931 - 2³ = 77952516923 is a prime.

It is a super-2 number, since 2×77952516931² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77952510931) 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, 2051382006 + ... + 2051382043.

It is an arithmetic number, because the mean of its divisors is an integer number (20513820250).

Almost surely, 2^77952516931 is an apocalyptic number.

77952516931 is a deficient number, since it is larger than the sum of its proper divisors (4102764069).

77952516931 is a wasteful number, since it uses less digits than its factorization.

77952516931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102764068.

The product of its digits is 3572100, while the sum is 55.

The spelling of 77952516931 in words is "seventy-seven billion, nine hundred fifty-two million, five hundred sixteen thousand, nine hundred thirty-one".