645820972104 has 128 divisors (see below), whose sum is σ = 2077882490880. Its totient is φ = 162334540800.

The previous prime is 645820972087. The next prime is 645820972117. The reversal of 645820972104 is 401279028546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5579329 + ... + 5693904.

It is an arithmetic number, because the mean of its divisors is an integer number (16233456960).

Almost surely, 2^645820972104 is an apocalyptic number.

It is an amenable number.

645820972104 is an abundant number, since it is smaller than the sum of its proper divisors (1432061518776).

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

645820972104 is a wasteful number, since it uses less digits than its factorization.

645820972104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11273291 (or 11273287 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 645820972104 in words is "six hundred forty-five billion, eight hundred twenty million, nine hundred seventy-two thousand, one hundred four".