13661966890141 has 4 divisors (see below), whose sum is σ = 13662736119484. Its totient is φ = 13661197660800.

The previous prime is 13661966890133. The next prime is 13661966890151. The reversal of 13661966890141 is 14109866916631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9125262848025 + 4536704042116 = 3020805^2 + 2129954^2 .

It is a cyclic number.

It is not a de Polignac number, because 13661966890141 - 2³ = 13661966890133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13661966890141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661966890151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384588030 + ... + 384623551.

It is an arithmetic number, because the mean of its divisors is an integer number (3415684029871).

Almost surely, 2^{13661966890141} is an apocalyptic number.

It is an amenable number.

13661966890141 is a deficient number, since it is larger than the sum of its proper divisors (769229343).

13661966890141 is an equidigital number, since it uses as much as digits as its factorization.

13661966890141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769229342.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 13661966890141 in words is "thirteen trillion, six hundred sixty-one billion, nine hundred sixty-six million, eight hundred ninety thousand, one hundred forty-one".