77491539864 has 32 divisors (see below), whose sum is σ = 215254278000. Its totient is φ = 25830513216.

The previous prime is 77491539857. The next prime is 77491539967. The reversal of 77491539864 is 46893519477.

77491539864 is a `hidden beast` number, since 7 + 7 + 4 + 91 + 539 + 8 + 6 + 4 = 666.

It is a super-2 number, since 2×77491539864² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179378349 + ... + 179378780.

Almost surely, 2^77491539864 is an apocalyptic number.

It is an amenable number.

77491539864 is an abundant number, since it is smaller than the sum of its proper divisors (137762738136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77491539864 is a wasteful number, since it uses less digits than its factorization.

77491539864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358757144 (or 358757134 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 77491539864 in words is "seventy-seven billion, four hundred ninety-one million, five hundred thirty-nine thousand, eight hundred sixty-four".