12305207691 has 16 divisors (see below), whose sum is σ = 20834214400. Its totient is φ = 7031547144.

The previous prime is 12305207657. The next prime is 12305207701. The reversal of 12305207691 is 19670250321.

12305207691 is a `hidden beast` number, since 12 + 30 + 520 + 7 + 6 + 91 = 666.

It is not a de Polignac number, because 12305207691 - 2²⁵ = 12271653259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12305207791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32553271 + ... + 32553648.

It is an arithmetic number, because the mean of its divisors is an integer number (1302138400).

Almost surely, 2^12305207691 is an apocalyptic number.

12305207691 is a deficient number, since it is larger than the sum of its proper divisors (8529006709).

12305207691 is an equidigital number, since it uses as much as digits as its factorization.

12305207691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65106935 (or 65106929 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 12305207691 in words is "twelve billion, three hundred five million, two hundred seven thousand, six hundred ninety-one".