11621831563661 has 24 divisors (see below), whose sum is σ = 13347761938560. Its totient is φ = 10092337159520.

The previous prime is 11621831563627. The next prime is 11621831563669. The reversal of 11621831563661 is 16636513812611.

It is not a de Polignac number, because 11621831563661 - 2⁴² = 7223785052557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621831563669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 742466 + ... + 4878003.

It is an arithmetic number, because the mean of its divisors is an integer number (556156747440).

Almost surely, 2^{11621831563661} is an apocalyptic number.

11621831563661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11621831563661 is a deficient number, since it is larger than the sum of its proper divisors (1725930374899).

11621831563661 is a wasteful number, since it uses less digits than its factorization.

11621831563661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5621257 (or 5621246 counting only the distinct ones).

The product of its digits is 933120, while the sum is 50.

The spelling of 11621831563661 in words is "eleven trillion, six hundred twenty-one billion, eight hundred thirty-one million, five hundred sixty-three thousand, six hundred sixty-one".