77646421504 has 20 divisors (see below), whose sum is σ = 155141190864. Its totient is φ = 38823210496.

The previous prime is 77646421481. The next prime is 77646421549. The reversal of 77646421504 is 40512464677.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75826072 + ... + 75827095.

Almost surely, 2^77646421504 is an apocalyptic number.

It is an amenable number.

77646421504 is a deficient number, since it is larger than the sum of its proper divisors (77494769360).

77646421504 is an equidigital number, since it uses as much as digits as its factorization.

77646421504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151653185 (or 151653169 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 77646421504 in words is "seventy-seven billion, six hundred forty-six million, four hundred twenty-one thousand, five hundred four".