12961693859 has 4 divisors (see below), whose sum is σ = 13005932016. Its totient is φ = 12917455704.

The previous prime is 12961693837. The next prime is 12961693873. The reversal of 12961693859 is 95839616921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95839616921 = 61 ⋅1571141261.

It is a cyclic number.

It is not a de Polignac number, because 12961693859 - 2²⁴ = 12944916643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12961693798 and 12961693807.

It is not an unprimeable number, because it can be changed into a prime (12961693819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22118639 + ... + 22119224.

It is an arithmetic number, because the mean of its divisors is an integer number (3251483004).

Almost surely, 2^12961693859 is an apocalyptic number.

12961693859 is a deficient number, since it is larger than the sum of its proper divisors (44238157).

12961693859 is an equidigital number, since it uses as much as digits as its factorization.

12961693859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44238156.

The product of its digits is 6298560, while the sum is 59.

The spelling of 12961693859 in words is "twelve billion, nine hundred sixty-one million, six hundred ninety-three thousand, eight hundred fifty-nine".