646875141578646 has 64 divisors (see below), whose sum is σ = 1351482560064000. Its totient is φ = 206228107109376.

The previous prime is 646875141578587. The next prime is 646875141578693.

646875141578646 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84540891 + ... + 91874438.

It is an arithmetic number, because the mean of its divisors is an integer number (21116915001000).

Almost surely, 2^{646875141578646} is an apocalyptic number.

646875141578646 is an abundant number, since it is smaller than the sum of its proper divisors (704607418485354).

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

646875141578646 is a wasteful number, since it uses less digits than its factorization.

646875141578646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176415653.

The product of its digits is 6502809600, while the sum is 78.

The spelling of 646875141578646 in words is "six hundred forty-six trillion, eight hundred seventy-five billion, one hundred forty-one million, five hundred seventy-eight thousand, six hundred forty-six".