280666747879 has 4 divisors (see below), whose sum is σ = 320761997584. Its totient is φ = 240571498176.

The previous prime is 280666747871. The next prime is 280666747927. The reversal of 280666747879 is 978747666082.

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 280666747879 - 2³ = 280666747871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280666747871) 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 3 ways as a sum of consecutive naturals, for example, 20047624842 + ... + 20047624855.

It is an arithmetic number, because the mean of its divisors is an integer number (80190499396).

Almost surely, 2^280666747879 is an apocalyptic number.

280666747879 is a deficient number, since it is larger than the sum of its proper divisors (40095249705).

280666747879 is an equidigital number, since it uses as much as digits as its factorization.

280666747879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40095249704.

The product of its (nonzero) digits is 341397504, while the sum is 70.

The spelling of 280666747879 in words is "two hundred eighty billion, six hundred sixty-six million, seven hundred forty-seven thousand, eight hundred seventy-nine".