279942755805 has 90 divisors (see below), whose sum is σ = 511371254394. Its totient is φ = 146514484800.

The previous prime is 279942755803. The next prime is 279942755831. The reversal of 279942755805 is 508557249972.

279942755805 is a `hidden beast` number, since 2 + 7 + 9 + 9 + 42 + 7 + 5 + 580 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 21727349604 + 258215406201 = 147402^2 + 508149^2 .

It is not a de Polignac number, because 279942755805 - 2¹ = 279942755803 is a prime.

It is a super-2 number, since 2×279942755805² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279942755801) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 649518940 + ... + 649519370.

Almost surely, 2^279942755805 is an apocalyptic number.

It is an amenable number.

279942755805 is a deficient number, since it is larger than the sum of its proper divisors (231428498589).

279942755805 is an frugal number, since it uses more digits than its factorization.

279942755805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 63504000, while the sum is 63.

The spelling of 279942755805 in words is "two hundred seventy-nine billion, nine hundred forty-two million, seven hundred fifty-five thousand, eight hundred five".