18621861696 has 336 divisors, whose sum is σ = 58580121600. Its totient is φ = 5633971200.

The previous prime is 18621861641. The next prime is 18621861701. The reversal of 18621861696 is 69616812681.

18621861696 is a `hidden beast` number, since 1 + 8 + 6 + 2 + 18 + 616 + 9 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44443375 + ... + 44443793.

It is an arithmetic number, because the mean of its divisors is an integer number (174345600).

Almost surely, 2^18621861696 is an apocalyptic number.

18621861696 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 18621861696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29290060800).

18621861696 is an abundant number, since it is smaller than the sum of its proper divisors (39958259904).

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

18621861696 is a wasteful number, since it uses less digits than its factorization.

18621861696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 605 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 18621861696 in words is "eighteen billion, six hundred twenty-one million, eight hundred sixty-one thousand, six hundred ninety-six".