12401810961 has 4 divisors (see below), whose sum is σ = 16535747952. Its totient is φ = 8267873972.

The previous prime is 12401810957. The next prime is 12401811001. The reversal of 12401810961 is 16901810421.

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 12401810961 - 2² = 12401810957 is a prime.

It is a super-2 number, since 2×12401810961² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12401810921) 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, 2066968491 + ... + 2066968496.

It is an arithmetic number, because the mean of its divisors is an integer number (4133936988).

Almost surely, 2^12401810961 is an apocalyptic number.

It is an amenable number.

12401810961 is a deficient number, since it is larger than the sum of its proper divisors (4133936991).

12401810961 is an equidigital number, since it uses as much as digits as its factorization.

12401810961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133936990.

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 12401810961 in words is "twelve billion, four hundred one million, eight hundred ten thousand, nine hundred sixty-one".