13942880251561 has 2 divisors, whose sum is σ = 13942880251562. Its totient is φ = 13942880251560.

The previous prime is 13942880251543. The next prime is 13942880251589. The reversal of 13942880251561 is 16515208824931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13519365643161 + 423514608400 = 3676869^2 + 650780^2 .

It is a cyclic number.

It is not a de Polignac number, because 13942880251561 - 2¹¹ = 13942880249513 is a prime.

It is not a weakly prime, because it can be changed into another prime (13942880251501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6971440125780 + 6971440125781.

It is an arithmetic number, because the mean of its divisors is an integer number (6971440125781).

Almost surely, 2^{13942880251561} is an apocalyptic number.

It is an amenable number.

13942880251561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13942880251561 is an equidigital number, since it uses as much as digits as its factorization.

13942880251561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 13942880251561 in words is "thirteen trillion, nine hundred forty-two billion, eight hundred eighty million, two hundred fifty-one thousand, five hundred sixty-one".