11571996257 has 2 divisors, whose sum is σ = 11571996258. Its totient is φ = 11571996256.

The previous prime is 11571996229. The next prime is 11571996263. The reversal of 11571996257 is 75269917511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11508140176 + 63856081 = 107276^2 + 7991^2 .

It is a cyclic number.

It is not a de Polignac number, because 11571996257 - 2⁶ = 11571996193 is a prime.

It is a super-2 number, since 2×11571996257² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11571996199 and 11571996208.

It is not a weakly prime, because it can be changed into another prime (11571996217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5785998128 + 5785998129.

It is an arithmetic number, because the mean of its divisors is an integer number (5785998129).

Almost surely, 2^11571996257 is an apocalyptic number.

It is an amenable number.

11571996257 is a deficient number, since it is larger than the sum of its proper divisors (1).

11571996257 is an equidigital number, since it uses as much as digits as its factorization.

11571996257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 53.

The spelling of 11571996257 in words is "eleven billion, five hundred seventy-one million, nine hundred ninety-six thousand, two hundred fifty-seven".