645101572 has 12 divisors (see below), whose sum is σ = 1130473036. Its totient is φ = 322109280.

The previous prime is 645101521. The next prime is 645101581. The reversal of 645101572 is 275101546.

It can be written as a sum of positive squares in 2 ways, for example, as 581484996 + 63616576 = 24114^2 + 7976^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107079 + ... + 112942.

Almost surely, 2^645101572 is an apocalyptic number.

It is an amenable number.

645101572 is a deficient number, since it is larger than the sum of its proper divisors (485371464).

645101572 is a wasteful number, since it uses less digits than its factorization.

645101572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220758 (or 220756 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 645101572 is about 25398.8498164779. The cubic root of 645101572 is about 864.0576111133.

The spelling of 645101572 in words is "six hundred forty-five million, one hundred one thousand, five hundred seventy-two".