11957041955557 has 4 divisors (see below), whose sum is σ = 12013710401056. Its totient is φ = 11900373510060.

The previous prime is 11957041955543. The next prime is 11957041955563. The reversal of 11957041955557 is 75555914075911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11957041955557 - 2⁷ = 11957041955429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11957041955587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28334222433 + ... + 28334222854.

It is an arithmetic number, because the mean of its divisors is an integer number (3003427600264).

Almost surely, 2^{11957041955557} is an apocalyptic number.

It is an amenable number.

11957041955557 is a deficient number, since it is larger than the sum of its proper divisors (56668445499).

11957041955557 is an equidigital number, since it uses as much as digits as its factorization.

11957041955557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56668445498.

The product of its (nonzero) digits is 49612500, while the sum is 64.

The spelling of 11957041955557 in words is "eleven trillion, nine hundred fifty-seven billion, forty-one million, nine hundred fifty-five thousand, five hundred fifty-seven".