12379999691 has 4 divisors (see below), whose sum is σ = 12382398984. Its totient is φ = 12377600400.

The previous prime is 12379999673. The next prime is 12379999693. The reversal of 12379999691 is 19699997321.

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 12379999691 - 2⁶ = 12379999627 is a prime.

It is a super-4 number, since 4×12379999691⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12379999693) 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, 1191890 + ... + 1202231.

It is an arithmetic number, because the mean of its divisors is an integer number (3095599746).

Almost surely, 2^12379999691 is an apocalyptic number.

12379999691 is a deficient number, since it is larger than the sum of its proper divisors (2399293).

12379999691 is an equidigital number, since it uses as much as digits as its factorization.

12379999691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399292.

The product of its digits is 14880348, while the sum is 65.

The spelling of 12379999691 in words is "twelve billion, three hundred seventy-nine million, nine hundred ninety-nine thousand, six hundred ninety-one".