645990375110 has 64 divisors (see below), whose sum is σ = 1235305080000. Its totient is φ = 242383245312.

The previous prime is 645990375071. The next prime is 645990375137. The reversal of 645990375110 is 11573099546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68622764 + ... + 68632176.

It is an arithmetic number, because the mean of its divisors is an integer number (19301641875).

Almost surely, 2^645990375110 is an apocalyptic number.

645990375110 is a deficient number, since it is larger than the sum of its proper divisors (589314704890).

645990375110 is a wasteful number, since it uses less digits than its factorization.

645990375110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745.

The product of its (nonzero) digits is 1020600, while the sum is 50.

The spelling of 645990375110 in words is "six hundred forty-five billion, nine hundred ninety million, three hundred seventy-five thousand, one hundred ten".