18234617856 has 416 divisors, whose sum is σ = 62529438720. Its totient is φ = 4593549312.

The previous prime is 18234617837. The next prime is 18234617881. The reversal of 18234617856 is 65871643281.

It is a tau number, because it is divible by the number of its divisors (416).

It is a junction number, because it is equal to n+sod(n) for n = 18234617799 and 18234617808.

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, 25718430 + ... + 25719138.

Almost surely, 2^18234617856 is an apocalyptic number.

18234617856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18234617856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31264719360).

18234617856 is an abundant number, since it is smaller than the sum of its proper divisors (44294820864).

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

18234617856 is a wasteful number, since it uses less digits than its factorization.

18234617856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 757 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 18234617856 in words is "eighteen billion, two hundred thirty-four million, six hundred seventeen thousand, eight hundred fifty-six".