640410650561536 has 44 divisors (see below), whose sum is σ = 1285177207629528. Its totient is φ = 318959390031872.

The previous prime is 640410650561531. The next prime is 640410650561581. The reversal of 640410650561536 is 635165056014046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640410650561531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216470346 + ... + 1216996681.

Almost surely, 2^{640410650561536} is an apocalyptic number.

It is an amenable number.

640410650561536 is an abundant number, since it is smaller than the sum of its proper divisors (644766557067992).

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

640410650561536 is a wasteful number, since it uses less digits than its factorization.

640410650561536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433467304 (or 2433467286 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 52.

The spelling of 640410650561536 in words is "six hundred forty trillion, four hundred ten billion, six hundred fifty million, five hundred sixty-one thousand, five hundred thirty-six".