645172575 has 12 divisors (see below), whose sum is σ = 1066685448. Its totient is φ = 344092000.

The previous prime is 645172553. The next prime is 645172621. The reversal of 645172575 is 575271546.

It is a happy number.

It is not a de Polignac number, because 645172575 - 2⁹ = 645172063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4301076 + ... + 4301225.

It is an arithmetic number, because the mean of its divisors is an integer number (88890454).

Almost surely, 2^645172575 is an apocalyptic number.

645172575 is a deficient number, since it is larger than the sum of its proper divisors (421512873).

645172575 is a wasteful number, since it uses less digits than its factorization.

645172575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8602314 (or 8602309 counting only the distinct ones).

The product of its digits is 294000, while the sum is 42.

The square root of 645172575 is about 25400.2475381639. The cubic root of 645172575 is about 864.0893107373.

The spelling of 645172575 in words is "six hundred forty-five million, one hundred seventy-two thousand, five hundred seventy-five".