18681962568 has 64 divisors (see below), whose sum is σ = 47248132800. Its totient is φ = 6155170560.

The previous prime is 18681962561. The next prime is 18681962569. The reversal of 18681962568 is 86526918681.

It is not an unprimeable number, because it can be changed into a prime (18681962561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1092855 + ... + 1109817.

It is an arithmetic number, because the mean of its divisors is an integer number (738252075).

Almost surely, 2^18681962568 is an apocalyptic number.

It is an amenable number.

18681962568 is an abundant number, since it is smaller than the sum of its proper divisors (28566170232).

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

18681962568 is a wasteful number, since it uses less digits than its factorization.

18681962568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502 (or 17498 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 60.

The spelling of 18681962568 in words is "eighteen billion, six hundred eighty-one million, nine hundred sixty-two thousand, five hundred sixty-eight".