645413051615 has 4 divisors (see below), whose sum is σ = 774495661944. Its totient is φ = 516330441288.

The previous prime is 645413051603. The next prime is 645413051623. The reversal of 645413051615 is 516150314546.

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

It is a cyclic number.

It is not a de Polignac number, because 645413051615 - 2¹² = 645413047519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64541305157 + ... + 64541305166.

It is an arithmetic number, because the mean of its divisors is an integer number (193623915486).

Almost surely, 2^645413051615 is an apocalyptic number.

645413051615 is a deficient number, since it is larger than the sum of its proper divisors (129082610329).

645413051615 is a wasteful number, since it uses less digits than its factorization.

645413051615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129082610328.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 645413051615 in words is "six hundred forty-five billion, four hundred thirteen million, fifty-one thousand, six hundred fifteen".