279857145505 has 16 divisors (see below), whose sum is σ = 396184863744. Its totient is φ = 185711653440.

The previous prime is 279857145479. The next prime is 279857145521. The reversal of 279857145505 is 505541758972.

It is a de Polignac number, because none of the positive numbers 2^k-279857145505 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 279857145505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128965342 + ... + 128967511.

It is an arithmetic number, because the mean of its divisors is an integer number (24761553984).

Almost surely, 2^279857145505 is an apocalyptic number.

It is an amenable number.

279857145505 is a deficient number, since it is larger than the sum of its proper divisors (116327718239).

279857145505 is a wasteful number, since it uses less digits than its factorization.

279857145505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257932896.

The product of its (nonzero) digits is 17640000, while the sum is 58.

The spelling of 279857145505 in words is "two hundred seventy-nine billion, eight hundred fifty-seven million, one hundred forty-five thousand, five hundred five".