645225512 has 8 divisors (see below), whose sum is σ = 1209797850. Its totient is φ = 322612752.

The previous prime is 645225479. The next prime is 645225517. The reversal of 645225512 is 215522546.

It can be written as a sum of positive squares in only one way, i.e., 627702916 + 17522596 = 25054^2 + 4186^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×645225512² = 832631922671324288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645225517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40326587 + ... + 40326602.

Almost surely, 2^645225512 is an apocalyptic number.

It is an amenable number.

645225512 is a deficient number, since it is larger than the sum of its proper divisors (564572338).

645225512 is a wasteful number, since it uses less digits than its factorization.

645225512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80653195 (or 80653191 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 645225512 is about 25401.2895735630. The cubic root of 645225512 is about 864.1129431971.

The spelling of 645225512 in words is "six hundred forty-five million, two hundred twenty-five thousand, five hundred twelve".