646091306976 has 72 divisors (see below), whose sum is σ = 1736349025320. Its totient is φ = 210355251456.

The previous prime is 646091306963. The next prime is 646091307011. The reversal of 646091306976 is 679603190646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1642431 + ... + 1997438.

It is an arithmetic number, because the mean of its divisors is an integer number (24115958685).

Almost surely, 2^646091306976 is an apocalyptic number.

It is an amenable number.

646091306976 is an abundant number, since it is smaller than the sum of its proper divisors (1090257718344).

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

646091306976 is a wasteful number, since it uses less digits than its factorization.

646091306976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639968 (or 3639917 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 57.

The spelling of 646091306976 in words is "six hundred forty-six billion, ninety-one million, three hundred six thousand, nine hundred seventy-six".