640022461068 has 24 divisors (see below), whose sum is σ = 1495204749360. Its totient is φ = 213080962240.

The previous prime is 640022461031. The next prime is 640022461081. The reversal of 640022461068 is 860164220046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32472003 + ... + 32491706.

It is an arithmetic number, because the mean of its divisors is an integer number (62300197890).

Almost surely, 2^640022461068 is an apocalyptic number.

It is an amenable number.

640022461068 is an abundant number, since it is smaller than the sum of its proper divisors (855182288292).

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

640022461068 is a wasteful number, since it uses less digits than its factorization.

640022461068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64964537 (or 64964535 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 640022461068 in words is "six hundred forty billion, twenty-two million, four hundred sixty-one thousand, sixty-eight".