644052870195 has 16 divisors (see below), whose sum is σ = 1177696677120. Its totient is φ = 294424169184.

The previous prime is 644052870193. The next prime is 644052870199. The reversal of 644052870195 is 591078250446.

644052870195 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644052870195 - 2¹ = 644052870193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644052870193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066918325 + ... + 3066918534.

It is an arithmetic number, because the mean of its divisors is an integer number (73606042320).

Almost surely, 2^644052870195 is an apocalyptic number.

644052870195 is a deficient number, since it is larger than the sum of its proper divisors (533643806925).

644052870195 is a wasteful number, since it uses less digits than its factorization.

644052870195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6133836874.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 644052870195 in words is "six hundred forty-four billion, fifty-two million, eight hundred seventy thousand, one hundred ninety-five".