645052116536 has 8 divisors (see below), whose sum is σ = 1209472718520. Its totient is φ = 322526058264.

The previous prime is 645052116529. The next prime is 645052116547. The reversal of 645052116536 is 635611250546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40315757276 + ... + 40315757291.

It is an arithmetic number, because the mean of its divisors is an integer number (151184089815).

Almost surely, 2^645052116536 is an apocalyptic number.

It is an amenable number.

645052116536 is a deficient number, since it is larger than the sum of its proper divisors (564420601984).

645052116536 is a wasteful number, since it uses less digits than its factorization.

645052116536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80631514573 (or 80631514569 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 645052116536 in words is "six hundred forty-five billion, fifty-two million, one hundred sixteen thousand, five hundred thirty-six".