279798377921 has 16 divisors (see below), whose sum is σ = 303529878288. Its totient is φ = 256876953600.

The previous prime is 279798377909. The next prime is 279798378007. The reversal of 279798377921 is 129773897972.

It can be written as a sum of positive squares in 8 ways, for example, as 66996074896 + 212802303025 = 258836^2 + 461305^2 .

It is a cyclic number.

It is not a de Polignac number, because 279798377921 - 2⁶ = 279798377857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (279795377921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5075321 + ... + 5130153.

It is an arithmetic number, because the mean of its divisors is an integer number (18970617393).

Almost surely, 2^279798377921 is an apocalyptic number.

It is an amenable number.

279798377921 is a deficient number, since it is larger than the sum of its proper divisors (23731500367).

279798377921 is a wasteful number, since it uses less digits than its factorization.

279798377921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62212.

The product of its digits is 168031584, while the sum is 71.

The spelling of 279798377921 in words is "two hundred seventy-nine billion, seven hundred ninety-eight million, three hundred seventy-seven thousand, nine hundred twenty-one".