15631214660161 has 2 divisors, whose sum is σ = 15631214660162. Its totient is φ = 15631214660160.

The previous prime is 15631214660081. The next prime is 15631214660167. The reversal of 15631214660161 is 16106641213651.

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., 14772061781136 + 859152879025 = 3843444^2 + 926905^2 .

It is a cyclic number.

It is not a de Polignac number, because 15631214660161 - 2⁴¹ = 13432191404609 is a prime.

It is not a weakly prime, because it can be changed into another prime (15631214660167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7815607330080 + 7815607330081.

It is an arithmetic number, because the mean of its divisors is an integer number (7815607330081).

Almost surely, 2^{15631214660161} is an apocalyptic number.

It is an amenable number.

15631214660161 is a deficient number, since it is larger than the sum of its proper divisors (1).

15631214660161 is an equidigital number, since it uses as much as digits as its factorization.

15631214660161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 15631214660161 in words is "fifteen trillion, six hundred thirty-one billion, two hundred fourteen million, six hundred sixty thousand, one hundred sixty-one".