18553998707 has 2 divisors, whose sum is σ = 18553998708. Its totient is φ = 18553998706.

The previous prime is 18553998677. The next prime is 18553998709. The reversal of 18553998707 is 70789935581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18553998707 - 2³⁰ = 17480256883 is a prime.

Together with 18553998709, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18553998707.

It is not a weakly prime, because it can be changed into another prime (18553998709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9276999353 + 9276999354.

It is an arithmetic number, because the mean of its divisors is an integer number (9276999354).

Almost surely, 2^18553998707 is an apocalyptic number.

18553998707 is a deficient number, since it is larger than the sum of its proper divisors (1).

18553998707 is an equidigital number, since it uses as much as digits as its factorization.

18553998707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19051200, while the sum is 62.

The spelling of 18553998707 in words is "eighteen billion, five hundred fifty-three million, nine hundred ninety-eight thousand, seven hundred seven".