645139077195 has 16 divisors (see below), whose sum is σ = 1033096576032. Its totient is φ = 343782823680.

The previous prime is 645139077169. The next prime is 645139077259. The reversal of 645139077195 is 591770931546.

It is not a de Polignac number, because 645139077195 - 2¹⁹ = 645138552907 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18191122 + ... + 18226551.

It is an arithmetic number, because the mean of its divisors is an integer number (64568536002).

Almost surely, 2^645139077195 is an apocalyptic number.

645139077195 is a deficient number, since it is larger than the sum of its proper divisors (387957498837).

645139077195 is a wasteful number, since it uses less digits than its factorization.

645139077195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36418862.

The product of its (nonzero) digits is 7144200, while the sum is 57.

The spelling of 645139077195 in words is "six hundred forty-five billion, one hundred thirty-nine million, seventy-seven thousand, one hundred ninety-five".