15668863361257 has 2 divisors, whose sum is σ = 15668863361258. Its totient is φ = 15668863361256.

The previous prime is 15668863361183. The next prime is 15668863361287. The reversal of 15668863361257 is 75216336886651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8004027481321 + 7664835879936 = 2829139^2 + 2768544^2 .

It is a cyclic number.

It is not a de Polignac number, because 15668863361257 - 2²³ = 15668854972649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15668863361192 and 15668863361201.

It is not a weakly prime, because it can be changed into another prime (15668863361287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7834431680628 + 7834431680629.

It is an arithmetic number, because the mean of its divisors is an integer number (7834431680629).

Almost surely, 2^{15668863361257} is an apocalyptic number.

It is an amenable number.

15668863361257 is a deficient number, since it is larger than the sum of its proper divisors (1).

15668863361257 is an equidigital number, since it uses as much as digits as its factorization.

15668863361257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 261273600, while the sum is 67.

The spelling of 15668863361257 in words is "fifteen trillion, six hundred sixty-eight billion, eight hundred sixty-three million, three hundred sixty-one thousand, two hundred fifty-seven".