18698662656 has 108 divisors (see below), whose sum is σ = 54025924680. Its totient is φ = 6219816960.

The previous prime is 18698662651. The next prime is 18698662687. The reversal of 18698662656 is 65626689681.

It is a junction number, because it is equal to n+sod(n) for n = 18698662593 and 18698662602.

It is not an unprimeable number, because it can be changed into a prime (18698662651) 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, 1123000 + ... + 1139528.

Almost surely, 2^18698662656 is an apocalyptic number.

18698662656 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 18698662656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27012962340).

18698662656 is an abundant number, since it is smaller than the sum of its proper divisors (35327262024).

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

18698662656 is a wasteful number, since it uses less digits than its factorization.

18698662656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17042 (or 17025 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 63.

The spelling of 18698662656 in words is "eighteen billion, six hundred ninety-eight million, six hundred sixty-two thousand, six hundred fifty-six".