640165268005800 has 96 divisors (see below), whose sum is σ = 1984805780088480. Its totient is φ = 170685495187200.

The previous prime is 640165268005789. The next prime is 640165268005871. The reversal of 640165268005800 is 8500862561046.

It is a super-2 number, since 2×640165268005800² (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 23 ways as a sum of consecutive naturals, for example, 74823031 + ... + 82938630.

It is an arithmetic number, because the mean of its divisors is an integer number (20675060209255).

Almost surely, 2^{640165268005800} is an apocalyptic number.

640165268005800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640165268005800 is an abundant number, since it is smaller than the sum of its proper divisors (1344640512082680).

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

640165268005800 is a wasteful number, since it uses less digits than its factorization.

640165268005800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157768443 (or 157768434 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 640165268005800 in words is "six hundred forty trillion, one hundred sixty-five billion, two hundred sixty-eight million, five thousand, eight hundred".