640165513512 has 128 divisors (see below), whose sum is σ = 1848021350400. Its totient is φ = 181015776000.

The previous prime is 640165513501. The next prime is 640165513513. The reversal of 640165513512 is 215315561046.

It is not an unprimeable number, because it can be changed into a prime (640165513513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6777087 + ... + 6870897.

It is an arithmetic number, because the mean of its divisors is an integer number (14437666800).

Almost surely, 2^640165513512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640165513512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924010675200).

640165513512 is an abundant number, since it is smaller than the sum of its proper divisors (1207855836888).

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

640165513512 is a wasteful number, since it uses less digits than its factorization.

640165513512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94247 (or 94243 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 640165513512 in words is "six hundred forty billion, one hundred sixty-five million, five hundred thirteen thousand, five hundred twelve".