645868961495 has 8 divisors (see below), whose sum is σ = 775136058720. Its totient is φ = 516632965920.

The previous prime is 645868961461. The next prime is 645868961537. The reversal of 645868961495 is 594169868546.

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

It is not a de Polignac number, because 645868961495 - 2³² = 641573994199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7729700 + ... + 7812809.

It is an arithmetic number, because the mean of its divisors is an integer number (96892007340).

Almost surely, 2^645868961495 is an apocalyptic number.

645868961495 is a deficient number, since it is larger than the sum of its proper divisors (129267097225).

645868961495 is a wasteful number, since it uses less digits than its factorization.

645868961495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550825.

The product of its digits is 447897600, while the sum is 71.

The spelling of 645868961495 in words is "six hundred forty-five billion, eight hundred sixty-eight million, nine hundred sixty-one thousand, four hundred ninety-five".