13816440661 has 2 divisors, whose sum is σ = 13816440662. Its totient is φ = 13816440660.

The previous prime is 13816440611. The next prime is 13816440689. The reversal of 13816440661 is 16604461831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13617489636 + 198951025 = 116694^2 + 14105^2 .

It is a cyclic number.

It is not a de Polignac number, because 13816440661 - 2¹⁵ = 13816407893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13816440611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6908220330 + 6908220331.

It is an arithmetic number, because the mean of its divisors is an integer number (6908220331).

Almost surely, 2^13816440661 is an apocalyptic number.

It is an amenable number.

13816440661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13816440661 is an equidigital number, since it uses as much as digits as its factorization.

13816440661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 13816440661 in words is "thirteen billion, eight hundred sixteen million, four hundred forty thousand, six hundred sixty-one".