13878270661 has 2 divisors, whose sum is σ = 13878270662. Its totient is φ = 13878270660.

The previous prime is 13878270649. The next prime is 13878270667. The reversal of 13878270661 is 16607287831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13822469761 + 55800900 = 117569^2 + 7470^2 .

It is an emirp because it is prime and its reverse (16607287831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13878270661 - 2¹⁷ = 13878139589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13878270667) by changing a digit.

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 as a sum of consecutive naturals, namely, 6939135330 + 6939135331.

It is an arithmetic number, because the mean of its divisors is an integer number (6939135331).

Almost surely, 2^13878270661 is an apocalyptic number.

It is an amenable number.

13878270661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13878270661 is an equidigital number, since it uses as much as digits as its factorization.

13878270661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 13878270661 in words is "thirteen billion, eight hundred seventy-eight million, two hundred seventy thousand, six hundred sixty-one".