18839420953 has 2 divisors, whose sum is σ = 18839420954. Its totient is φ = 18839420952.

The previous prime is 18839420903. The next prime is 18839420981. The reversal of 18839420953 is 35902493881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17649653904 + 1189767049 = 132852^2 + 34493^2 .

It is a cyclic number.

It is not a de Polignac number, because 18839420953 - 2³³ = 10249486361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18839420953.

It is not a weakly prime, because it can be changed into another prime (18839420903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419710476 + 9419710477.

It is an arithmetic number, because the mean of its divisors is an integer number (9419710477).

Almost surely, 2^18839420953 is an apocalyptic number.

It is an amenable number.

18839420953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839420953 is an equidigital number, since it uses as much as digits as its factorization.

18839420953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 18839420953 in words is "eighteen billion, eight hundred thirty-nine million, four hundred twenty thousand, nine hundred fifty-three".