18890468191 has 12 divisors (see below), whose sum is σ = 21980552040. Its totient is φ = 16187463600.

The previous prime is 18890468161. The next prime is 18890468197. The reversal of 18890468191 is 19186409881.

It is a happy number.

It is not a de Polignac number, because 18890468191 - 2²¹ = 18888371039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890468197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138645 + ... + 238753.

It is an arithmetic number, because the mean of its divisors is an integer number (1831712670).

Almost surely, 2^18890468191 is an apocalyptic number.

18890468191 is a deficient number, since it is larger than the sum of its proper divisors (3090083849).

18890468191 is a wasteful number, since it uses less digits than its factorization.

18890468191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103974 (or 103967 counting only the distinct ones).

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

The spelling of 18890468191 in words is "eighteen billion, eight hundred ninety million, four hundred sixty-eight thousand, one hundred ninety-one".