645158321504 has 48 divisors (see below), whose sum is σ = 1312793164368. Its totient is φ = 311861601792.

The previous prime is 645158321503. The next prime is 645158321513. The reversal of 645158321504 is 405123851546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645158321503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549454 + ... + 1921229.

It is an arithmetic number, because the mean of its divisors is an integer number (27349857591).

Almost surely, 2^645158321504 is an apocalyptic number.

It is an amenable number.

645158321504 is an abundant number, since it is smaller than the sum of its proper divisors (667634842864).

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

645158321504 is a wasteful number, since it uses less digits than its factorization.

645158321504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470887 (or 3470879 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 645158321504 in words is "six hundred forty-five billion, one hundred fifty-eight million, three hundred twenty-one thousand, five hundred four".