645450799536 has 80 divisors (see below), whose sum is σ = 1854840707200. Its totient is φ = 214899676992.

The previous prime is 645450799493. The next prime is 645450799549. The reversal of 645450799536 is 635997054546.

645450799536 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 5 + 0 + 7 + 99 + 536 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498586 + ... + 1240761.

It is an arithmetic number, because the mean of its divisors is an integer number (23185508840).

Almost surely, 2^645450799536 is an apocalyptic number.

It is an amenable number.

645450799536 is an abundant number, since it is smaller than the sum of its proper divisors (1209389907664).

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

645450799536 is a wasteful number, since it uses less digits than its factorization.

645450799536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740223 (or 1740211 counting only the distinct ones).

The product of its (nonzero) digits is 122472000, while the sum is 63.

The spelling of 645450799536 in words is "six hundred forty-five billion, four hundred fifty million, seven hundred ninety-nine thousand, five hundred thirty-six".