11995418661 has 4 divisors (see below), whose sum is σ = 15993891552. Its totient is φ = 7996945772.

The previous prime is 11995418657. The next prime is 11995418681. The reversal of 11995418661 is 16681459911.

11995418661 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, 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 11995418661 - 2² = 11995418657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11995418681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999236441 + ... + 1999236446.

It is an arithmetic number, because the mean of its divisors is an integer number (3998472888).

Almost surely, 2^11995418661 is an apocalyptic number.

It is an amenable number.

11995418661 is a deficient number, since it is larger than the sum of its proper divisors (3998472891).

11995418661 is an equidigital number, since it uses as much as digits as its factorization.

11995418661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998472890.

The product of its digits is 466560, while the sum is 51.

The spelling of 11995418661 in words is "eleven billion, nine hundred ninety-five million, four hundred eighteen thousand, six hundred sixty-one".