640455713124 has 12 divisors (see below), whose sum is σ = 1494396663984. Its totient is φ = 213485237704.

The previous prime is 640455713081. The next prime is 640455713167. The reversal of 640455713124 is 421317554046.

It is an interprime number because it is at equal distance from previous prime (640455713081) and next prime (640455713167).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26685654702 + ... + 26685654725.

It is an arithmetic number, because the mean of its divisors is an integer number (124533055332).

Almost surely, 2^640455713124 is an apocalyptic number.

It is an amenable number.

640455713124 is an abundant number, since it is smaller than the sum of its proper divisors (853940950860).

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

640455713124 is a wasteful number, since it uses less digits than its factorization.

640455713124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53371309434 (or 53371309432 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 640455713124 in words is "six hundred forty billion, four hundred fifty-five million, seven hundred thirteen thousand, one hundred twenty-four".