315550632160661 has 2 divisors, whose sum is σ = 315550632160662. Its totient is φ = 315550632160660.

The previous prime is 315550632160601. The next prime is 315550632160681. The reversal of 315550632160661 is 166061236055513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177773955576100 + 137776676584561 = 13333190^2 + 11737831^2 .

It is an emirp because it is prime and its reverse (166061236055513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315550632160661 - 2⁶ = 315550632160597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315550632160601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157775316080330 + 157775316080331.

It is an arithmetic number, because the mean of its divisors is an integer number (157775316080331).

Almost surely, 2^{315550632160661} is an apocalyptic number.

It is an amenable number.

315550632160661 is a deficient number, since it is larger than the sum of its proper divisors (1).

315550632160661 is an equidigital number, since it uses as much as digits as its factorization.

315550632160661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 315550632160661 in words is "three hundred fifteen trillion, five hundred fifty billion, six hundred thirty-two million, one hundred sixty thousand, six hundred sixty-one".