18931089696 has 96 divisors (see below), whose sum is σ = 50169974400. Its totient is φ = 6250235904.

The previous prime is 18931089689. The next prime is 18931089763. The reversal of 18931089696 is 69698013981.

It is a tau number, because it is divible by the number of its divisors (96).

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, 4449106 + ... + 4453358.

It is an arithmetic number, because the mean of its divisors is an integer number (522603900).

Almost surely, 2^18931089696 is an apocalyptic number.

18931089696 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 18931089696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25084987200).

18931089696 is an abundant number, since it is smaller than the sum of its proper divisors (31238884704).

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

18931089696 is a wasteful number, since it uses less digits than its factorization.

18931089696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698 (or 4690 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 60.

The spelling of 18931089696 in words is "eighteen billion, nine hundred thirty-one million, eighty-nine thousand, six hundred ninety-six".