18091291626 has 64 divisors (see below), whose sum is σ = 40853007360. Its totient is φ = 5933133360.

The previous prime is 18091291601. The next prime is 18091291651. The reversal of 18091291626 is 62619219081.

18091291626 is a `hidden beast` number, since 1 + 8 + 0 + 9 + 12 + 9 + 1 + 626 = 666.

It is an interprime number because it is at equal distance from previous prime (18091291601) and next prime (18091291651).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3496021 + ... + 3501191.

It is an arithmetic number, because the mean of its divisors is an integer number (638328240).

Almost surely, 2^18091291626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18091291626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20426503680).

18091291626 is an abundant number, since it is smaller than the sum of its proper divisors (22761715734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18091291626 is a wasteful number, since it uses less digits than its factorization.

18091291626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216 (or 6210 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 18091291626 in words is "eighteen billion, ninety-one million, two hundred ninety-one thousand, six hundred twenty-six".