645112659 has 8 divisors (see below), whose sum is σ = 860477440. Its totient is φ = 429911496.

The previous prime is 645112631. The next prime is 645112679. The reversal of 645112659 is 956211546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645112659 - 2⁹ = 645112147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645112679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31387 + ... + 47700.

It is an arithmetic number, because the mean of its divisors is an integer number (107559680).

Almost surely, 2^645112659 is an apocalyptic number.

645112659 is a deficient number, since it is larger than the sum of its proper divisors (215364781).

645112659 is a wasteful number, since it uses less digits than its factorization.

645112659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81809.

The product of its digits is 64800, while the sum is 39.

The square root of 645112659 is about 25399.0680734550. The cubic root of 645112659 is about 864.0625611099.

It can be divided in two parts, 6451 and 12659, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 645112659 in words is "six hundred forty-five million, one hundred twelve thousand, six hundred fifty-nine".