11957855449 has 2 divisors, whose sum is σ = 11957855450. Its totient is φ = 11957855448.

The previous prime is 11957855431. The next prime is 11957855531. The reversal of 11957855449 is 94455875911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8011503049 + 3946352400 = 89507^2 + 62820^2 .

It is a cyclic number.

It is not a de Polignac number, because 11957855449 - 2⁵ = 11957855417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11957855393 and 11957855402.

It is not a weakly prime, because it can be changed into another prime (11957852449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5978927724 + 5978927725.

It is an arithmetic number, because the mean of its divisors is an integer number (5978927725).

Almost surely, 2^11957855449 is an apocalyptic number.

It is an amenable number.

11957855449 is a deficient number, since it is larger than the sum of its proper divisors (1).

11957855449 is an equidigital number, since it uses as much as digits as its factorization.

11957855449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 58.

The spelling of 11957855449 in words is "eleven billion, nine hundred fifty-seven million, eight hundred fifty-five thousand, four hundred forty-nine".