278961992668 has 12 divisors (see below), whose sum is σ = 493668695520. Its totient is φ = 137913793952.

The previous prime is 278961992657. The next prime is 278961992669. The reversal of 278961992668 is 866299169872.

It is a self number, because there is not a number n which added to its sum of digits gives 278961992668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278961992669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391800196 + ... + 391800907.

It is an arithmetic number, because the mean of its divisors is an integer number (41139057960).

Almost surely, 2^278961992668 is an apocalyptic number.

It is an amenable number.

278961992668 is a deficient number, since it is larger than the sum of its proper divisors (214706702852).

278961992668 is a wasteful number, since it uses less digits than its factorization.

278961992668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783601196 (or 783601194 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 73.

The spelling of 278961992668 in words is "two hundred seventy-eight billion, nine hundred sixty-one million, nine hundred ninety-two thousand, six hundred sixty-eight".