18898088857 has 2 divisors, whose sum is σ = 18898088858. Its totient is φ = 18898088856.

The previous prime is 18898088821. The next prime is 18898088861. The reversal of 18898088857 is 75888089881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16867775376 + 2030313481 = 129876^2 + 45059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18898088857 is a prime.

It is not a weakly prime, because it can be changed into another prime (18898088257) 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, 9449044428 + 9449044429.

It is an arithmetic number, because the mean of its divisors is an integer number (9449044429).

Almost surely, 2^18898088857 is an apocalyptic number.

It is an amenable number.

18898088857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18898088857 is an equidigital number, since it uses as much as digits as its factorization.

18898088857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82575360, while the sum is 70.

The spelling of 18898088857 in words is "eighteen billion, eight hundred ninety-eight million, eighty-eight thousand, eight hundred fifty-seven".