644732047141 has 32 divisors (see below), whose sum is σ = 835407820800. Its totient is φ = 483195637440.

The previous prime is 644732047139. The next prime is 644732047187. The reversal of 644732047141 is 141740237446.

It is a cyclic number.

It is not a de Polignac number, because 644732047141 - 2¹ = 644732047139 is a prime.

It is a super-2 number, since 2×644732047141² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644732047111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13044846 + ... + 13094176.

It is an arithmetic number, because the mean of its divisors is an integer number (26106494400).

Almost surely, 2^644732047141 is an apocalyptic number.

It is an amenable number.

644732047141 is a deficient number, since it is larger than the sum of its proper divisors (190675773659).

644732047141 is a wasteful number, since it uses less digits than its factorization.

644732047141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56929.

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 644732047141 in words is "six hundred forty-four billion, seven hundred thirty-two million, forty-seven thousand, one hundred forty-one".