278791957213 has 16 divisors (see below), whose sum is σ = 347641176960. Its totient is φ = 217205236800.

The previous prime is 278791957207. The next prime is 278791957217. The reversal of 278791957213 is 312759197872.

It is a cyclic number.

It is not a de Polignac number, because 278791957213 - 2¹⁷ = 278791826141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278791957217) 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, 189003 + ... + 770263.

It is an arithmetic number, because the mean of its divisors is an integer number (21727573560).

Almost surely, 2^278791957213 is an apocalyptic number.

It is an amenable number.

278791957213 is a deficient number, since it is larger than the sum of its proper divisors (68849219747).

278791957213 is a wasteful number, since it uses less digits than its factorization.

278791957213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587508.

The product of its digits is 13335840, while the sum is 61.

The spelling of 278791957213 in words is "two hundred seventy-eight billion, seven hundred ninety-one million, nine hundred fifty-seven thousand, two hundred thirteen".