18208921573441 has 8 divisors (see below), whose sum is σ = 19184445500480. Its totient is φ = 17235113609808.

The previous prime is 18208921573391. The next prime is 18208921573459. The reversal of 18208921573441 is 14437512980281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18208921573441 - 2¹⁵ = 18208921540673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18208921571441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428969061 + ... + 429011506.

It is an arithmetic number, because the mean of its divisors is an integer number (2398055687560).

Almost surely, 2^{18208921573441} is an apocalyptic number.

It is an amenable number.

18208921573441 is a deficient number, since it is larger than the sum of its proper divisors (975523927039).

18208921573441 is a wasteful number, since it uses less digits than its factorization.

18208921573441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857981703.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 18208921573441 in words is "eighteen trillion, two hundred eight billion, nine hundred twenty-one million, five hundred seventy-three thousand, four hundred forty-one".