11661955 has 4 divisors (see below), whose sum is σ = 13994352. Its totient is φ = 9329560.

The previous prime is 11661911. The next prime is 11661959. The reversal of 11661955 is 55916611.

11661955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11661955 - 2⁷ = 11661827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11661955.

It is not an unprimeable number, because it can be changed into a prime (11661959) 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, 1166191 + ... + 1166200.

It is an arithmetic number, because the mean of its divisors is an integer number (3498588).

Almost surely, 2^11661955 is an apocalyptic number.

11661955 is a deficient number, since it is larger than the sum of its proper divisors (2332397).

11661955 is an equidigital number, since it uses as much as digits as its factorization.

11661955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332396.

The product of its digits is 8100, while the sum is 34.

The square root of 11661955 is about 3414.9604682924. The cubic root of 11661955 is about 226.7725344073.

The spelling of 11661955 in words is "eleven million, six hundred sixty-one thousand, nine hundred fifty-five".