11961204617 has 4 divisors (see below), whose sum is σ = 12105315600. Its totient is φ = 11817093636.

The previous prime is 11961204583. The next prime is 11961204623. The reversal of 11961204617 is 71640216911.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71640216911 = 167117 ⋅428683.

It is a cyclic number.

It is not a de Polignac number, because 11961204617 - 2⁶ = 11961204553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11961204917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72055367 + ... + 72055532.

It is an arithmetic number, because the mean of its divisors is an integer number (3026328900).

Almost surely, 2^11961204617 is an apocalyptic number.

It is an amenable number.

11961204617 is a deficient number, since it is larger than the sum of its proper divisors (144110983).

11961204617 is an equidigital number, since it uses as much as digits as its factorization.

11961204617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144110982.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 11961204617 in words is "eleven billion, nine hundred sixty-one million, two hundred four thousand, six hundred seventeen".