12365891617 has 4 divisors (see below), whose sum is σ = 12380221440. Its totient is φ = 12351561796.

The previous prime is 12365891609. The next prime is 12365891621. The reversal of 12365891617 is 71619856321.

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 12365891617 - 2³ = 12365891609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12365891627) 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, 7163617 + ... + 7165342.

It is an arithmetic number, because the mean of its divisors is an integer number (3095055360).

Almost surely, 2^12365891617 is an apocalyptic number.

It is an amenable number.

12365891617 is a deficient number, since it is larger than the sum of its proper divisors (14329823).

12365891617 is an equidigital number, since it uses as much as digits as its factorization.

12365891617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14329822.

The product of its digits is 544320, while the sum is 49.

The spelling of 12365891617 in words is "twelve billion, three hundred sixty-five million, eight hundred ninety-one thousand, six hundred seventeen".