640242414405234 has 24 divisors (see below), whose sum is σ = 1387192809075372. Its totient is φ = 213413997950880.

The previous prime is 640242414405203. The next prime is 640242414405299. The reversal of 640242414405234 is 432504414242046.

640242414405234 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 4 + 2 + 4 + 1 + 4 + 405 + 234 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 638491886949609 + 1750527455625 = 25268397^2 + 1323075^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 640242414405234.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18604204 + ... + 40331144.

Almost surely, 2^{640242414405234} is an apocalyptic number.

640242414405234 is an abundant number, since it is smaller than the sum of its proper divisors (746950394670138).

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

640242414405234 is a wasteful number, since it uses less digits than its factorization.

640242414405234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23364042 (or 23364039 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 45.

The spelling of 640242414405234 in words is "six hundred forty trillion, two hundred forty-two billion, four hundred fourteen million, four hundred five thousand, two hundred thirty-four".