18962638889 has 2 divisors, whose sum is σ = 18962638890. Its totient is φ = 18962638888.

The previous prime is 18962638883. The next prime is 18962638969. The reversal of 18962638889 is 98883626981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18935961664 + 26677225 = 137608^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 18962638889 - 2⁸ = 18962638633 is a prime.

It is not a weakly prime, because it can be changed into another prime (18962638883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481319444 + 9481319445.

It is an arithmetic number, because the mean of its divisors is an integer number (9481319445).

Almost surely, 2^18962638889 is an apocalyptic number.

It is an amenable number.

18962638889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18962638889 is an equidigital number, since it uses as much as digits as its factorization.

18962638889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71663616, while the sum is 68.

The spelling of 18962638889 in words is "eighteen billion, nine hundred sixty-two million, six hundred thirty-eight thousand, eight hundred eighty-nine".