645580171415 has 16 divisors (see below), whose sum is σ = 808779722688. Its totient is φ = 493764074496.

The previous prime is 645580171367. The next prime is 645580171429. The reversal of 645580171415 is 514171085546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645580171415 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645580171415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159652 + ... + 1623561.

It is an arithmetic number, because the mean of its divisors is an integer number (50548732668).

Almost surely, 2^645580171415 is an apocalyptic number.

645580171415 is a deficient number, since it is larger than the sum of its proper divisors (163199551273).

645580171415 is a wasteful number, since it uses less digits than its factorization.

645580171415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785258.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 645580171415 in words is "six hundred forty-five billion, five hundred eighty million, one hundred seventy-one thousand, four hundred fifteen".