645304342015 has 4 divisors (see below), whose sum is σ = 774365210424. Its totient is φ = 516243473608.

The previous prime is 645304341959. The next prime is 645304342057. The reversal of 645304342015 is 510243403546.

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 645304342015 - 2²⁵ = 645270787583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64530434197 + ... + 64530434206.

It is an arithmetic number, because the mean of its divisors is an integer number (193591302606).

Almost surely, 2^645304342015 is an apocalyptic number.

645304342015 is a deficient number, since it is larger than the sum of its proper divisors (129060868409).

645304342015 is a wasteful number, since it uses less digits than its factorization.

645304342015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129060868408.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 645304342015 in words is "six hundred forty-five billion, three hundred four million, three hundred forty-two thousand, fifteen".