645525411368 has 16 divisors (see below), whose sum is σ = 1218069448980. Its totient is φ = 320706891648.

The previous prime is 645525411361. The next prime is 645525411371. The reversal of 645525411368 is 863114525546.

It can be written as a sum of positive squares in 2 ways, for example, as 527218305604 + 118307105764 = 726098^2 + 343958^2 .

It is not an unprimeable number, because it can be changed into a prime (645525411361) 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, 256975421 + ... + 256977932.

Almost surely, 2^645525411368 is an apocalyptic number.

It is an amenable number.

645525411368 is a deficient number, since it is larger than the sum of its proper divisors (572544037612).

645525411368 is a wasteful number, since it uses less digits than its factorization.

645525411368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513953516 (or 513953512 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 50.

The spelling of 645525411368 in words is "six hundred forty-five billion, five hundred twenty-five million, four hundred eleven thousand, three hundred sixty-eight".