12779350661 has 8 divisors (see below), whose sum is σ = 15932697024. Its totient is φ = 9957935520.

The previous prime is 12779350637. The next prime is 12779350679. The reversal of 12779350661 is 16605397721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12779350661 - 2¹⁰ = 12779349637 is a prime.

It is a super-2 number, since 2×12779350661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779350621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82982720 + ... + 82982873.

It is an arithmetic number, because the mean of its divisors is an integer number (1991587128).

Almost surely, 2^12779350661 is an apocalyptic number.

12779350661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12779350661 is a deficient number, since it is larger than the sum of its proper divisors (3153346363).

12779350661 is a wasteful number, since it uses less digits than its factorization.

12779350661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165965611.

The product of its (nonzero) digits is 476280, while the sum is 47.

The spelling of 12779350661 in words is "twelve billion, seven hundred seventy-nine million, three hundred fifty thousand, six hundred sixty-one".