12261779999 has 8 divisors (see below), whose sum is σ = 14014492320. Its totient is φ = 10509325056.

The previous prime is 12261779977. The next prime is 12261780019. The reversal of 12261779999 is 99997716221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12261779999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261779899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51707 + ... + 164915.

It is an arithmetic number, because the mean of its divisors is an integer number (1751811540).

Almost surely, 2^12261779999 is an apocalyptic number.

12261779999 is a deficient number, since it is larger than the sum of its proper divisors (1752712321).

12261779999 is a wasteful number, since it uses less digits than its factorization.

12261779999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128689.

The product of its digits is 7715736, while the sum is 62.

The spelling of 12261779999 in words is "twelve billion, two hundred sixty-one million, seven hundred seventy-nine thousand, nine hundred ninety-nine".