77497797631 has 4 divisors (see below), whose sum is σ = 77887234000. Its totient is φ = 77108361264.

The previous prime is 77497797623. The next prime is 77497797647. The reversal of 77497797631 is 13679779477.

It is a happy number.

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 77497797631 - 2³ = 77497797623 is a prime.

It is a super-2 number, since 2×77497797631² (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 (77497797131) 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, 194717886 + ... + 194718283.

It is an arithmetic number, because the mean of its divisors is an integer number (19471808500).

Almost surely, 2^77497797631 is an apocalyptic number.

77497797631 is a deficient number, since it is larger than the sum of its proper divisors (389436369).

77497797631 is a wasteful number, since it uses less digits than its factorization.

77497797631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389436368.

The product of its digits is 98018424, while the sum is 67.

The spelling of 77497797631 in words is "seventy-seven billion, four hundred ninety-seven million, seven hundred ninety-seven thousand, six hundred thirty-one".