13561292257 has 2 divisors, whose sum is σ = 13561292258. Its totient is φ = 13561292256.

The previous prime is 13561292221. The next prime is 13561292263. The reversal of 13561292257 is 75229216531.

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., 13511505121 + 49787136 = 116239^2 + 7056^2 .

It is a cyclic number.

It is not a de Polignac number, because 13561292257 - 2¹⁵ = 13561259489 is a prime.

It is not a weakly prime, because it can be changed into another prime (13561293257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780646128 + 6780646129.

It is an arithmetic number, because the mean of its divisors is an integer number (6780646129).

Almost surely, 2^13561292257 is an apocalyptic number.

It is an amenable number.

13561292257 is a deficient number, since it is larger than the sum of its proper divisors (1).

13561292257 is an equidigital number, since it uses as much as digits as its factorization.

13561292257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The spelling of 13561292257 in words is "thirteen billion, five hundred sixty-one million, two hundred ninety-two thousand, two hundred fifty-seven".