13661731297920 has 64 divisors (see below), whose sum is σ = 43546768518240. Its totient is φ = 3643128345600.

The previous prime is 13661731297909. The next prime is 13661731297931. The reversal of 13661731297920 is 2979213716631.

It is an interprime number because it is at equal distance from previous prime (13661731297909) and next prime (13661731297931).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3557740606 + ... + 3557744445.

Almost surely, 2^{13661731297920} is an apocalyptic number.

13661731297920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13661731297920 is an abundant number, since it is smaller than the sum of its proper divisors (29885037220320).

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

13661731297920 is an equidigital number, since it uses as much as digits as its factorization.

13661731297920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115485073 (or 7115485061 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 57.

The spelling of 13661731297920 in words is "thirteen trillion, six hundred sixty-one billion, seven hundred thirty-one million, two hundred ninety-seven thousand, nine hundred twenty".