11557649437 has 2 divisors, whose sum is σ = 11557649438. Its totient is φ = 11557649436.

The previous prime is 11557649371. The next prime is 11557649459. The reversal of 11557649437 is 73494675511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6180947161 + 5376702276 = 78619^2 + 73326^2 .

It is a cyclic number.

It is not a de Polignac number, because 11557649437 - 2⁷ = 11557649309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11557649237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778824718 + 5778824719.

It is an arithmetic number, because the mean of its divisors is an integer number (5778824719).

Almost surely, 2^11557649437 is an apocalyptic number.

It is an amenable number.

11557649437 is a deficient number, since it is larger than the sum of its proper divisors (1).

11557649437 is an equidigital number, since it uses as much as digits as its factorization.

11557649437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 52.

The spelling of 11557649437 in words is "eleven billion, five hundred fifty-seven million, six hundred forty-nine thousand, four hundred thirty-seven".