18916088491 has 2 divisors, whose sum is σ = 18916088492. Its totient is φ = 18916088490.

The previous prime is 18916088489. The next prime is 18916088519. The reversal of 18916088491 is 19488061981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18916088491 - 2¹ = 18916088489 is a prime.

Together with 18916088489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18916088461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458044245 + 9458044246.

It is an arithmetic number, because the mean of its divisors is an integer number (9458044246).

Almost surely, 2^18916088491 is an apocalyptic number.

18916088491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916088491 is an equidigital number, since it uses as much as digits as its factorization.

18916088491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 55.

It can be divided in two parts, 189160884 and 91, that added together give a triangular number (189160975 = T₁₉₄₅₀).

The spelling of 18916088491 in words is "eighteen billion, nine hundred sixteen million, eighty-eight thousand, four hundred ninety-one".