81640600604 has 24 divisors (see below), whose sum is σ = 151065008640. Its totient is φ = 38498439024.

The previous prime is 81640600589. The next prime is 81640600627. The reversal of 81640600604 is 40600604618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2391614 + ... + 2425509.

It is an arithmetic number, because the mean of its divisors is an integer number (6294375360).

Almost surely, 2^81640600604 is an apocalyptic number.

It is an amenable number.

81640600604 is a deficient number, since it is larger than the sum of its proper divisors (69424408036).

81640600604 is a wasteful number, since it uses less digits than its factorization.

81640600604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817369 (or 4817367 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 81640600604 in words is "eighty-one billion, six hundred forty million, six hundred thousand, six hundred four".