11381817664 has 56 divisors (see below), whose sum is σ = 26068007808. Its totient is φ = 4829606400.

The previous prime is 11381817583. The next prime is 11381817677. The reversal of 11381817664 is 46671818311.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80524 + ... + 171019.

Almost surely, 2^11381817664 is an apocalyptic number.

11381817664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11381817664 is an abundant number, since it is smaller than the sum of its proper divisors (14686190144).

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

11381817664 is a wasteful number, since it uses less digits than its factorization.

11381817664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251663 (or 251653 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The spelling of 11381817664 in words is "eleven billion, three hundred eighty-one million, eight hundred seventeen thousand, six hundred sixty-four".