645601615215 has 8 divisors (see below), whose sum is σ = 1032962584368. Its totient is φ = 344320861440.

The previous prime is 645601615207. The next prime is 645601615229. The reversal of 645601615215 is 512516106546.

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

It is not a de Polignac number, because 645601615215 - 2³ = 645601615207 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 7 ways as a sum of consecutive naturals, for example, 21520053826 + ... + 21520053855.

It is an arithmetic number, because the mean of its divisors is an integer number (129120323046).

Almost surely, 2^645601615215 is an apocalyptic number.

645601615215 is a deficient number, since it is larger than the sum of its proper divisors (387360969153).

645601615215 is a wasteful number, since it uses less digits than its factorization.

645601615215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43040107689.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 645601615215 in words is "six hundred forty-five billion, six hundred one million, six hundred fifteen thousand, two hundred fifteen".