18914967553 has 2 divisors, whose sum is σ = 18914967554. Its totient is φ = 18914967552.

The previous prime is 18914967529. The next prime is 18914967557. The reversal of 18914967553 is 35576941981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10627960464 + 8287007089 = 103092^2 + 91033^2 .

It is a cyclic number.

It is not a de Polignac number, because 18914967553 - 2⁵ = 18914967521 is a prime.

It is not a weakly prime, because it can be changed into another prime (18914967557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457483776 + 9457483777.

It is an arithmetic number, because the mean of its divisors is an integer number (9457483777).

Almost surely, 2^18914967553 is an apocalyptic number.

It is an amenable number.

18914967553 is a deficient number, since it is larger than the sum of its proper divisors (1).

18914967553 is an equidigital number, since it uses as much as digits as its factorization.

18914967553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 58.

The spelling of 18914967553 in words is "eighteen billion, nine hundred fourteen million, nine hundred sixty-seven thousand, five hundred fifty-three".