18534166656 has 128 divisors (see below), whose sum is σ = 49758096960. Its totient is φ = 6112296960.

The previous prime is 18534166643. The next prime is 18534166661. The reversal of 18534166656 is 65666143581.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18534166599 and 18534166608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30038860 + ... + 30039476.

Almost surely, 2^18534166656 is an apocalyptic number.

18534166656 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 18534166656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24879048480).

18534166656 is an abundant number, since it is smaller than the sum of its proper divisors (31223930304).

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

18534166656 is a wasteful number, since it uses less digits than its factorization.

18534166656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342 (or 1330 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 51.

The spelling of 18534166656 in words is "eighteen billion, five hundred thirty-four million, one hundred sixty-six thousand, six hundred fifty-six".