12261646445431 has 4 divisors (see below), whose sum is σ = 12261950315272. Its totient is φ = 12261342575592.

The previous prime is 12261646445417. The next prime is 12261646445437. The reversal of 12261646445431 is 13454464616221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12261646445431 - 2⁷ = 12261646445303 is a prime.

It is a super-2 number, since 2×12261646445431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261646445437) 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, 151874385 + ... + 151955098.

It is an arithmetic number, because the mean of its divisors is an integer number (3065487578818).

Almost surely, 2^{12261646445431} is an apocalyptic number.

12261646445431 is a deficient number, since it is larger than the sum of its proper divisors (303869841).

12261646445431 is an equidigital number, since it uses as much as digits as its factorization.

12261646445431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303869840.

The product of its digits is 3317760, while the sum is 49.

The spelling of 12261646445431 in words is "twelve trillion, two hundred sixty-one billion, six hundred forty-six million, four hundred forty-five thousand, four hundred thirty-one".