77964719831 has 4 divisors (see below), whose sum is σ = 78679992600. Its totient is φ = 77249447064.

The previous prime is 77964719827. The next prime is 77964719851. The reversal of 77964719831 is 13891746977.

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 77964719831 - 2² = 77964719827 is a prime.

It is a super-2 number, since 2×77964719831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77964719801) 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, 357636221 + ... + 357636438.

It is an arithmetic number, because the mean of its divisors is an integer number (19669998150).

Almost surely, 2^77964719831 is an apocalyptic number.

77964719831 is a deficient number, since it is larger than the sum of its proper divisors (715272769).

77964719831 is a wasteful number, since it uses less digits than its factorization.

77964719831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715272768.

The product of its digits is 16003008, while the sum is 62.

The spelling of 77964719831 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred nineteen thousand, eight hundred thirty-one".