77946761564 has 18 divisors (see below), whose sum is σ = 158677336440. Its totient is φ = 33405754872.

The previous prime is 77946761551. The next prime is 77946761573. The reversal of 77946761564 is 46516764977.

It is a junction number, because it is equal to n+sod(n) for n = 77946761497 and 77946761506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198843584 + ... + 198843975.

It is an arithmetic number, because the mean of its divisors is an integer number (8815407580).

Almost surely, 2^77946761564 is an apocalyptic number.

It is an amenable number.

77946761564 is an abundant number, since it is smaller than the sum of its proper divisors (80730574876).

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

77946761564 is a wasteful number, since it uses less digits than its factorization.

77946761564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397687577 (or 397687568 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 62.

The spelling of 77946761564 in words is "seventy-seven billion, nine hundred forty-six million, seven hundred sixty-one thousand, five hundred sixty-four".