13498878661 has 2 divisors, whose sum is σ = 13498878662. Its totient is φ = 13498878660.

The previous prime is 13498878647. The next prime is 13498878707. The reversal of 13498878661 is 16687889431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7382074561 + 6116804100 = 85919^2 + 78210^2 .

It is a cyclic number.

It is not a de Polignac number, because 13498878661 - 2³³ = 4908944069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13498878661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13498878061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6749439330 + 6749439331.

It is an arithmetic number, because the mean of its divisors is an integer number (6749439331).

Almost surely, 2^13498878661 is an apocalyptic number.

It is an amenable number.

13498878661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13498878661 is an equidigital number, since it uses as much as digits as its factorization.

13498878661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 61.

The spelling of 13498878661 in words is "thirteen billion, four hundred ninety-eight million, eight hundred seventy-eight thousand, six hundred sixty-one".