11961660994 has 4 divisors (see below), whose sum is σ = 17942491494. Its totient is φ = 5980830496.

The previous prime is 11961660973. The next prime is 11961661031. The reversal of 11961660994 is 49906616911.

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

It can be written as a sum of positive squares in only one way, i.e., 8716649769 + 3245011225 = 93363^2 + 56965^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2990415247 + ... + 2990415250.

Almost surely, 2^11961660994 is an apocalyptic number.

11961660994 is a deficient number, since it is larger than the sum of its proper divisors (5980830500).

11961660994 is an equidigital number, since it uses as much as digits as its factorization.

11961660994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980830499.

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 11961660994 in words is "eleven billion, nine hundred sixty-one million, six hundred sixty thousand, nine hundred ninety-four".