18855914969 has 2 divisors, whose sum is σ = 18855914970. Its totient is φ = 18855914968.

The previous prime is 18855914929. The next prime is 18855914977. The reversal of 18855914969 is 96941955881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17509905625 + 1346009344 = 132325^2 + 36688^2 .

It is a cyclic number.

It is not a de Polignac number, because 18855914969 - 2⁸ = 18855914713 is a prime.

It is a super-2 number, since 2×18855914969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18855914929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9427957484 + 9427957485.

It is an arithmetic number, because the mean of its divisors is an integer number (9427957485).

Almost surely, 2^18855914969 is an apocalyptic number.

It is an amenable number.

18855914969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18855914969 is an equidigital number, since it uses as much as digits as its factorization.

18855914969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 65.

The spelling of 18855914969 in words is "eighteen billion, eight hundred fifty-five million, nine hundred fourteen thousand, nine hundred sixty-nine".