640765162842 has 24 divisors (see below), whose sum is σ = 1490759767296. Its totient is φ = 183075760728.

The previous prime is 640765162831. The next prime is 640765162903. The reversal of 640765162842 is 248261567046.

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, 1089736378 + ... + 1089736965.

It is an arithmetic number, because the mean of its divisors is an integer number (62114990304).

Almost surely, 2^640765162842 is an apocalyptic number.

640765162842 is an abundant number, since it is smaller than the sum of its proper divisors (849994604454).

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

640765162842 is a wasteful number, since it uses less digits than its factorization.

640765162842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179473362 (or 2179473355 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 640765162842 in words is "six hundred forty billion, seven hundred sixty-five million, one hundred sixty-two thousand, eight hundred forty-two".