12511081961 has 8 divisors (see below), whose sum is σ = 14304783360. Its totient is φ = 10718981568.

The previous prime is 12511081939. The next prime is 12511081993. The reversal of 12511081961 is 16918011521.

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

It is a cyclic number.

It is not a de Polignac number, because 12511081961 - 2¹⁰ = 12511080937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12511081931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383456 + ... + 414801.

It is an arithmetic number, because the mean of its divisors is an integer number (1788097920).

Almost surely, 2^12511081961 is an apocalyptic number.

It is an amenable number.

12511081961 is a deficient number, since it is larger than the sum of its proper divisors (1793701399).

12511081961 is an equidigital number, since it uses as much as digits as its factorization.

12511081961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800503.

The product of its (nonzero) digits is 4320, while the sum is 35.

The spelling of 12511081961 in words is "twelve billion, five hundred eleven million, eighty-one thousand, nine hundred sixty-one".