645697325850 has 48 divisors (see below), whose sum is σ = 1601487834528. Its totient is φ = 172168914240.

The previous prime is 645697325821. The next prime is 645697325873. The reversal of 645697325850 is 58523796546.

645697325850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1345737 + ... + 1761363.

It is an arithmetic number, because the mean of its divisors is an integer number (33364329886).

Almost surely, 2^645697325850 is an apocalyptic number.

645697325850 is an abundant number, since it is smaller than the sum of its proper divisors (955790508678).

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

645697325850 is a wasteful number, since it uses less digits than its factorization.

645697325850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425999 (or 425994 counting only the distinct ones).

The product of its (nonzero) digits is 54432000, while the sum is 60.

The spelling of 645697325850 in words is "six hundred forty-five billion, six hundred ninety-seven million, three hundred twenty-five thousand, eight hundred fifty".