315453434251661 has 2 divisors, whose sum is σ = 315453434251662. Its totient is φ = 315453434251660.

The previous prime is 315453434251603. The next prime is 315453434251667. The reversal of 315453434251661 is 166152434354513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210927143335561 + 104526290916100 = 14523331^2 + 10223810^2 .

It is a cyclic number.

It is not a de Polignac number, because 315453434251661 - 2³⁴ = 315436254382477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315453434251667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157726717125830 + 157726717125831.

It is an arithmetic number, because the mean of its divisors is an integer number (157726717125831).

Almost surely, 2^{315453434251661} is an apocalyptic number.

It is an amenable number.

315453434251661 is a deficient number, since it is larger than the sum of its proper divisors (1).

315453434251661 is an equidigital number, since it uses as much as digits as its factorization.

315453434251661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552000, while the sum is 53.

The spelling of 315453434251661 in words is "three hundred fifteen trillion, four hundred fifty-three billion, four hundred thirty-four million, two hundred fifty-one thousand, six hundred sixty-one".