18161923626 has 256 divisors, whose sum is σ = 51748761600. Its totient is φ = 4585248000.

The previous prime is 18161923601. The next prime is 18161923643. The reversal of 18161923626 is 62632916181.

18161923626 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 19 + 2 + 3 + 626 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 24777156 + ... + 24777888.

It is an arithmetic number, because the mean of its divisors is an integer number (202143600).

Almost surely, 2^18161923626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18161923626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25874380800).

18161923626 is an abundant number, since it is smaller than the sum of its proper divisors (33586837974).

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

18161923626 is a wasteful number, since it uses less digits than its factorization.

18161923626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 916 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 18161923626 in words is "eighteen billion, one hundred sixty-one million, nine hundred twenty-three thousand, six hundred twenty-six".