18103627657 has 2 divisors, whose sum is σ = 18103627658. Its totient is φ = 18103627656.

The previous prime is 18103627651. The next prime is 18103627699. The reversal of 18103627657 is 75672630181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11122022521 + 6981605136 = 105461^2 + 83556^2 .

It is a cyclic number.

It is not a de Polignac number, because 18103627657 - 2¹¹ = 18103625609 is a prime.

It is not a weakly prime, because it can be changed into another prime (18103627651) 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, 9051813828 + 9051813829.

It is an arithmetic number, because the mean of its divisors is an integer number (9051813829).

Almost surely, 2^18103627657 is an apocalyptic number.

It is an amenable number.

18103627657 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103627657 is an equidigital number, since it uses as much as digits as its factorization.

18103627657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 18103627657 in words is "eighteen billion, one hundred three million, six hundred twenty-seven thousand, six hundred fifty-seven".