645112658 has 4 divisors (see below), whose sum is σ = 967668990. Its totient is φ = 322556328.

The previous prime is 645112631. The next prime is 645112679. The reversal of 645112658 is 856211546.

It is a happy number.

645112658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 640241809 + 4870849 = 25303^2 + 2207^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161278163 + ... + 161278166.

Almost surely, 2^645112658 is an apocalyptic number.

645112658 is a deficient number, since it is larger than the sum of its proper divisors (322556332).

645112658 is a wasteful number, since it uses less digits than its factorization.

645112658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322556331.

The product of its digits is 57600, while the sum is 38.

The square root of 645112658 is about 25399.0680537692. The cubic root of 645112658 is about 864.0625606635.

The spelling of 645112658 in words is "six hundred forty-five million, one hundred twelve thousand, six hundred fifty-eight".