645155622 has 12 divisors (see below), whose sum is σ = 1397837220. Its totient is φ = 215051868.

The previous prime is 645155611. The next prime is 645155671. The reversal of 645155622 is 226551546.

645155622 is a `hidden beast` number, since 645 + 1 + 5 + 5 + 6 + 2 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17920972 + ... + 17921007.

It is an arithmetic number, because the mean of its divisors is an integer number (116486435).

Almost surely, 2^645155622 is an apocalyptic number.

645155622 is an abundant number, since it is smaller than the sum of its proper divisors (752681598).

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

645155622 is a wasteful number, since it uses less digits than its factorization.

645155622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35841987 (or 35841984 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 645155622 is about 25399.9138187514. The cubic root of 645155622 is about 864.0817422019.

The spelling of 645155622 in words is "six hundred forty-five million, one hundred fifty-five thousand, six hundred twenty-two".