18733044521 has 2 divisors, whose sum is σ = 18733044522. Its totient is φ = 18733044520.

The previous prime is 18733044427. The next prime is 18733044527. The reversal of 18733044521 is 12544033781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13657194496 + 5075850025 = 116864^2 + 71245^2 .

It is a cyclic number.

It is not a de Polignac number, because 18733044521 - 2²⁶ = 18665935657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18733044527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9366522260 + 9366522261.

It is an arithmetic number, because the mean of its divisors is an integer number (9366522261).

Almost surely, 2^18733044521 is an apocalyptic number.

It is an amenable number.

18733044521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18733044521 is an equidigital number, since it uses as much as digits as its factorization.

18733044521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 18733044521 in words is "eighteen billion, seven hundred thirty-three million, forty-four thousand, five hundred twenty-one".