11551975957 has 2 divisors, whose sum is σ = 11551975958. Its totient is φ = 11551975956.

The previous prime is 11551975943. The next prime is 11551975991. The reversal of 11551975957 is 75957915511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10425635236 + 1126340721 = 102106^2 + 33561^2 .

It is an emirp because it is prime and its reverse (75957915511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11551975957 - 2³¹ = 9404492309 is a prime.

It is a super-2 number, since 2×11551975957² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11551975898 and 11551975907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11551975907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775987978 + 5775987979.

It is an arithmetic number, because the mean of its divisors is an integer number (5775987979).

Almost surely, 2^11551975957 is an apocalyptic number.

It is an amenable number.

11551975957 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551975957 is an equidigital number, since it uses as much as digits as its factorization.

11551975957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2480625, while the sum is 55.

The spelling of 11551975957 in words is "eleven billion, five hundred fifty-one million, nine hundred seventy-five thousand, nine hundred fifty-seven".