18898089887 has 2 divisors, whose sum is σ = 18898089888. Its totient is φ = 18898089886.

The previous prime is 18898089869. The next prime is 18898089913. The reversal of 18898089887 is 78898089881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18898089887 - 2⁸ = 18898089631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18898089857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449044943 + 9449044944.

It is an arithmetic number, because the mean of its divisors is an integer number (9449044944).

Almost surely, 2^18898089887 is an apocalyptic number.

18898089887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18898089887 is an equidigital number, since it uses as much as digits as its factorization.

18898089887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148635648, while the sum is 74.

The spelling of 18898089887 in words is "eighteen billion, eight hundred ninety-eight million, eighty-nine thousand, eight hundred eighty-seven".