77497997031 has 96 divisors (see below), whose sum is σ = 146523453440. Its totient is φ = 38326597632.

The previous prime is 77497996973. The next prime is 77497997047. The reversal of 77497997031 is 13079979477.

77497997031 is a `hidden beast` number, since 77 + 497 + 9 + 9 + 70 + 3 + 1 = 666.

It is not a de Polignac number, because 77497997031 - 2¹¹ = 77497994983 is a prime.

It is a super-2 number, since 2×77497997031² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 77497997031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77497996031) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1483746 + ... + 1535088.

Almost surely, 2^77497997031 is an apocalyptic number.

77497997031 is a deficient number, since it is larger than the sum of its proper divisors (69025456409).

77497997031 is a wasteful number, since it uses less digits than its factorization.

77497997031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51485 (or 51482 counting only the distinct ones).

The product of its (nonzero) digits is 21003948, while the sum is 63.

The spelling of 77497997031 in words is "seventy-seven billion, four hundred ninety-seven million, nine hundred ninety-seven thousand, thirty-one".