640120253044 has 48 divisors (see below), whose sum is σ = 1211610597120. Its totient is φ = 294758343680.

The previous prime is 640120253011. The next prime is 640120253081. The reversal of 640120253044 is 440352021046.

It is a super-2 number, since 2×640120253044² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640120252997 and 640120253015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16219167 + ... + 16258585.

It is an arithmetic number, because the mean of its divisors is an integer number (25241887440).

Almost surely, 2^640120253044 is an apocalyptic number.

It is an amenable number.

640120253044 is a deficient number, since it is larger than the sum of its proper divisors (571490344076).

640120253044 is a wasteful number, since it uses less digits than its factorization.

640120253044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44568 (or 44566 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The spelling of 640120253044 in words is "six hundred forty billion, one hundred twenty million, two hundred fifty-three thousand, forty-four".