12661935593 has 4 divisors (see below), whose sum is σ = 12663412608. Its totient is φ = 12660458580.

The previous prime is 12661935541. The next prime is 12661935613. The reversal of 12661935593 is 39553916621.

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 a de Polignac number, because none of the positive numbers 2^k-12661935593 is a prime.

It is a super-2 number, since 2×12661935593² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661935193) 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, 725573 + ... + 742818.

It is an arithmetic number, because the mean of its divisors is an integer number (3165853152).

Almost surely, 2^12661935593 is an apocalyptic number.

It is an amenable number.

12661935593 is a deficient number, since it is larger than the sum of its proper divisors (1477015).

12661935593 is an equidigital number, since it uses as much as digits as its factorization.

12661935593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477014.

The product of its digits is 1312200, while the sum is 50.

The spelling of 12661935593 in words is "twelve billion, six hundred sixty-one million, nine hundred thirty-five thousand, five hundred ninety-three".