11965345961 has 4 divisors (see below), whose sum is σ = 11970336000. Its totient is φ = 11960355924.

The previous prime is 11965345949. The next prime is 11965345967. The reversal of 11965345961 is 16954356911.

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 11965345961 - 2¹⁴ = 11965329577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11965345967) 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, 2491421 + ... + 2496218.

It is an arithmetic number, because the mean of its divisors is an integer number (2992584000).

Almost surely, 2^11965345961 is an apocalyptic number.

It is an amenable number.

11965345961 is a deficient number, since it is larger than the sum of its proper divisors (4990039).

11965345961 is an equidigital number, since it uses as much as digits as its factorization.

11965345961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990038.

The product of its digits is 874800, while the sum is 50.

The spelling of 11965345961 in words is "eleven billion, nine hundred sixty-five million, three hundred forty-five thousand, nine hundred sixty-one".