18656955137 has 2 divisors, whose sum is σ = 18656955138. Its totient is φ = 18656955136.

The previous prime is 18656955127. The next prime is 18656955179. The reversal of 18656955137 is 73155965681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14755203841 + 3901751296 = 121471^2 + 62464^2 .

It is a cyclic number.

It is not a de Polignac number, because 18656955137 - 2¹⁴ = 18656938753 is a prime.

It is not a weakly prime, because it can be changed into another prime (18656955127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9328477568 + 9328477569.

It is an arithmetic number, because the mean of its divisors is an integer number (9328477569).

Almost surely, 2^18656955137 is an apocalyptic number.

It is an amenable number.

18656955137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18656955137 is an equidigital number, since it uses as much as digits as its factorization.

18656955137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804000, while the sum is 56.

The spelling of 18656955137 in words is "eighteen billion, six hundred fifty-six million, nine hundred fifty-five thousand, one hundred thirty-seven".