11955518851955 has 16 divisors (see below), whose sum is σ = 16674040823040. Its totient is φ = 8059119728352.

The previous prime is 11955518851937. The next prime is 11955518851963. The reversal of 11955518851955 is 55915881555911.

It is not a de Polignac number, because 11955518851955 - 2²² = 11955514657651 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2894796689 + ... + 2894800818.

It is an arithmetic number, because the mean of its divisors is an integer number (1042127551440).

Almost surely, 2^{11955518851955} is an apocalyptic number.

11955518851955 is a deficient number, since it is larger than the sum of its proper divisors (4718521971085).

11955518851955 is an equidigital number, since it uses as much as digits as its factorization.

11955518851955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5789597578.

The product of its digits is 81000000, while the sum is 68.

The spelling of 11955518851955 in words is "eleven trillion, nine hundred fifty-five billion, five hundred eighteen million, eight hundred fifty-one thousand, nine hundred fifty-five".