640670373573444 has 96 divisors (see below), whose sum is σ = 1737162637056000. Its totient is φ = 203806401546528.

The previous prime is 640670373573437. The next prime is 640670373573509. The reversal of 640670373573444 is 444375373076046.

640670373573444 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 70 + 3 + 73 + 57 + 3 + 444 = 666.

It is a super-2 number, since 2×640670373573444² (a number of 30 digits) contains 22 as substring.

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, 292666734 + ... + 294847685.

It is an arithmetic number, because the mean of its divisors is an integer number (18095444136000).

Almost surely, 2^{640670373573444} is an apocalyptic number.

It is an amenable number.

640670373573444 is an abundant number, since it is smaller than the sum of its proper divisors (1096492263482556).

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

640670373573444 is a wasteful number, since it uses less digits than its factorization.

640670373573444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587514894 (or 587514886 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 63.

The spelling of 640670373573444 in words is "six hundred forty trillion, six hundred seventy billion, three hundred seventy-three million, five hundred seventy-three thousand, four hundred forty-four".