11990665361 has 4 divisors (see below), whose sum is σ = 11990909424. Its totient is φ = 11990421300.

The previous prime is 11990665327. The next prime is 11990665391. The reversal of 11990665361 is 16356609911.

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 11990665361 - 2²⁶ = 11923556497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990665321) 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, 19775 + ... + 156116.

It is an arithmetic number, because the mean of its divisors is an integer number (2997727356).

Almost surely, 2^11990665361 is an apocalyptic number.

It is an amenable number.

11990665361 is a deficient number, since it is larger than the sum of its proper divisors (244063).

11990665361 is an equidigital number, since it uses as much as digits as its factorization.

11990665361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244062.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 11990665361 in words is "eleven billion, nine hundred ninety million, six hundred sixty-five thousand, three hundred sixty-one".