11961642065 has 8 divisors (see below), whose sum is σ = 14355880128. Its totient is φ = 9568040560.

The previous prime is 11961642061. The next prime is 11961642067. The reversal of 11961642065 is 56024616911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11961642065 - 2² = 11961642061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11961642061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116771 + ... + 193800.

It is an arithmetic number, because the mean of its divisors is an integer number (1794485016).

Almost surely, 2^11961642065 is an apocalyptic number.

It is an amenable number.

11961642065 is a deficient number, since it is larger than the sum of its proper divisors (2394238063).

11961642065 is an equidigital number, since it uses as much as digits as its factorization.

11961642065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318279.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 11961642065 in words is "eleven billion, nine hundred sixty-one million, six hundred forty-two thousand, sixty-five".