13890266557 has 2 divisors, whose sum is σ = 13890266558. Its totient is φ = 13890266556.

The previous prime is 13890266519. The next prime is 13890266563. The reversal of 13890266557 is 75566209831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13477120281 + 413146276 = 116091^2 + 20326^2 .

It is a cyclic number.

It is not a de Polignac number, because 13890266557 - 2²⁷ = 13756048829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13890266587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945133278 + 6945133279.

It is an arithmetic number, because the mean of its divisors is an integer number (6945133279).

Almost surely, 2^13890266557 is an apocalyptic number.

It is an amenable number.

13890266557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13890266557 is an equidigital number, since it uses as much as digits as its factorization.

13890266557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 13890266557 in words is "thirteen billion, eight hundred ninety million, two hundred sixty-six thousand, five hundred fifty-seven".