645151708 has 12 divisors (see below), whose sum is σ = 1130085040. Its totient is φ = 322270272.

The previous prime is 645151693. The next prime is 645151709. The reversal of 645151708 is 807151546.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645151709) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 71613 + ... + 80116.

Almost surely, 2^645151708 is an apocalyptic number.

It is an amenable number.

645151708 is a deficient number, since it is larger than the sum of its proper divisors (484933332).

645151708 is a wasteful number, since it uses less digits than its factorization.

645151708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152796 (or 152794 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 645151708 is about 25399.8367711291. The cubic root of 645151708 is about 864.0799948081.

The spelling of 645151708 in words is "six hundred forty-five million, one hundred fifty-one thousand, seven hundred eight".