645635235641 has 16 divisors (see below), whose sum is σ = 747018220608. Its totient is φ = 551483520000.

The previous prime is 645635235599. The next prime is 645635235649. The reversal of 645635235641 is 146532536546.

It is a cyclic number.

It is not a de Polignac number, because 645635235641 - 2³⁴ = 628455366457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645635235641.

It is not an unprimeable number, because it can be changed into a prime (645635235649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2800235 + ... + 3022016.

It is an arithmetic number, because the mean of its divisors is an integer number (46688638788).

Almost surely, 2^645635235641 is an apocalyptic number.

It is an amenable number.

645635235641 is a deficient number, since it is larger than the sum of its proper divisors (101382984967).

645635235641 is a wasteful number, since it uses less digits than its factorization.

645635235641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822872.

The product of its digits is 7776000, while the sum is 50.

The spelling of 645635235641 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred thirty-five thousand, six hundred forty-one".