644018051084111 has 4 divisors (see below), whose sum is σ = 702565146637224. Its totient is φ = 585470955531000.

The previous prime is 644018051084087. The next prime is 644018051084117. The reversal of 644018051084111 is 111480150810446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 644018051084111 - 2¹⁸ = 644018050821967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644018051084117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29273547776540 + ... + 29273547776561.

It is an arithmetic number, because the mean of its divisors is an integer number (175641286659306).

Almost surely, 2^{644018051084111} is an apocalyptic number.

644018051084111 is a deficient number, since it is larger than the sum of its proper divisors (58547095553113).

644018051084111 is a wasteful number, since it uses less digits than its factorization.

644018051084111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58547095553112.

The product of its (nonzero) digits is 122880, while the sum is 44.

The spelling of 644018051084111 in words is "six hundred forty-four trillion, eighteen billion, fifty-one million, eighty-four thousand, one hundred eleven".