77619371664 has 80 divisors (see below), whose sum is σ = 212369532480. Its totient is φ = 24344555520.

The previous prime is 77619371659. The next prime is 77619371717. The reversal of 77619371664 is 46617391677.

It is a super-2 number, since 2×77619371664² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3613147 + ... + 3634565.

It is an arithmetic number, because the mean of its divisors is an integer number (2654619156).

Almost surely, 2^77619371664 is an apocalyptic number.

It is an amenable number.

77619371664 is an abundant number, since it is smaller than the sum of its proper divisors (134750160816).

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

77619371664 is a wasteful number, since it uses less digits than its factorization.

77619371664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25888 (or 25882 counting only the distinct ones).

The product of its digits is 8001504, while the sum is 57.

The spelling of 77619371664 in words is "seventy-seven billion, six hundred nineteen million, three hundred seventy-one thousand, six hundred sixty-four".