18975266461639 has 4 divisors (see below), whose sum is σ = 18982124168224. Its totient is φ = 18968408755056.

The previous prime is 18975266461579. The next prime is 18975266461667. The reversal of 18975266461639 is 93616466257981.

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

It is a cyclic number.

It is not a de Polignac number, because 18975266461639 - 2²¹ = 18975264364487 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 (18975266441639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3428849142 + ... + 3428854675.

It is an arithmetic number, because the mean of its divisors is an integer number (4745531042056).

Almost surely, 2^{18975266461639} is an apocalyptic number.

18975266461639 is a deficient number, since it is larger than the sum of its proper divisors (6857706585).

18975266461639 is an equidigital number, since it uses as much as digits as its factorization.

18975266461639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857706584.

The product of its digits is 705438720, while the sum is 73.

The spelling of 18975266461639 in words is "eighteen trillion, nine hundred seventy-five billion, two hundred sixty-six million, four hundred sixty-one thousand, six hundred thirty-nine".