4451879323621 has 4 divisors (see below), whose sum is σ = 4451922931500. Its totient is φ = 4451835715744.

The previous prime is 4451879323603. The next prime is 4451879323651. The reversal of 4451879323621 is 1263239781544.

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

It can be written as a sum of positive squares in 2 ways, for example, as 518356800900 + 3933522522721 = 719970^2 + 1983311^2 .

It is a cyclic number.

It is not a de Polignac number, because 4451879323621 - 2⁹ = 4451879323109 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 (4451879323601) 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, 21650446 + ... + 21855103.

It is an arithmetic number, because the mean of its divisors is an integer number (1112980732875).

Almost surely, 2^{4451879323621} is an apocalyptic number.

It is an amenable number.

4451879323621 is a deficient number, since it is larger than the sum of its proper divisors (43607879).

4451879323621 is a wasteful number, since it uses less digits than its factorization.

4451879323621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43607878.

The product of its digits is 8709120, while the sum is 55.

The spelling of 4451879323621 in words is "four trillion, four hundred fifty-one billion, eight hundred seventy-nine million, three hundred twenty-three thousand, six hundred twenty-one".