645173438585 has 32 divisors (see below), whose sum is σ = 835852131072. Its totient is φ = 475242681600.

The previous prime is 645173438549. The next prime is 645173438599. The reversal of 645173438585 is 585834371546.

It is not a de Polignac number, because 645173438585 - 2²⁸ = 644905003129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117152402 + ... + 117157908.

It is an arithmetic number, because the mean of its divisors is an integer number (26120379096).

Almost surely, 2^645173438585 is an apocalyptic number.

645173438585 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645173438585 is a deficient number, since it is larger than the sum of its proper divisors (190678692487).

645173438585 is a wasteful number, since it uses less digits than its factorization.

645173438585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713.

The product of its digits is 48384000, while the sum is 59.

The spelling of 645173438585 in words is "six hundred forty-five billion, one hundred seventy-three million, four hundred thirty-eight thousand, five hundred eighty-five".