11980951165 has 4 divisors (see below), whose sum is σ = 14377141404. Its totient is φ = 9584760928.

The previous prime is 11980951141. The next prime is 11980951193. The reversal of 11980951165 is 56115908911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56115908911 = 18311 ⋅3064601.

It can be written as a sum of positive squares in 2 ways, for example, as 1253584836 + 10727366329 = 35406^2 + 103573^2 .

It is a cyclic number.

It is not a de Polignac number, because 11980951165 - 2⁵ = 11980951133 is a prime.

It is a super-2 number, since 2×11980951165² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198095112 + ... + 1198095121.

It is an arithmetic number, because the mean of its divisors is an integer number (3594285351).

Almost surely, 2^11980951165 is an apocalyptic number.

It is an amenable number.

11980951165 is a deficient number, since it is larger than the sum of its proper divisors (2396190239).

11980951165 is an equidigital number, since it uses as much as digits as its factorization.

11980951165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396190238.

The product of its (nonzero) digits is 97200, while the sum is 46.

The spelling of 11980951165 in words is "eleven billion, nine hundred eighty million, nine hundred fifty-one thousand, one hundred sixty-five".