77155387836 has 12 divisors (see below), whose sum is σ = 180029238312. Its totient is φ = 25718462608.

The previous prime is 77155387801. The next prime is 77155387847. The reversal of 77155387836 is 63878355177.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 77155387836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3214807815 + ... + 3214807838.

It is an arithmetic number, because the mean of its divisors is an integer number (15002436526).

Almost surely, 2^77155387836 is an apocalyptic number.

It is an amenable number.

77155387836 is an abundant number, since it is smaller than the sum of its proper divisors (102873850476).

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

77155387836 is a wasteful number, since it uses less digits than its factorization.

77155387836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6429615660 (or 6429615658 counting only the distinct ones).

The product of its digits is 29635200, while the sum is 60.

The spelling of 77155387836 in words is "seventy-seven billion, one hundred fifty-five million, three hundred eighty-seven thousand, eight hundred thirty-six".