278994853957 has 2 divisors, whose sum is σ = 278994853958. Its totient is φ = 278994853956.

The previous prime is 278994853933. The next prime is 278994854027. The reversal of 278994853957 is 759358499872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272702239681 + 6292614276 = 522209^2 + 79326^2 .

It is a cyclic number.

It is not a de Polignac number, because 278994853957 - 2³¹ = 276847370309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278994853457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139497426978 + 139497426979.

It is an arithmetic number, because the mean of its divisors is an integer number (139497426979).

Almost surely, 2^278994853957 is an apocalyptic number.

It is an amenable number.

278994853957 is a deficient number, since it is larger than the sum of its proper divisors (1).

278994853957 is an equidigital number, since it uses as much as digits as its factorization.

278994853957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1371686400, while the sum is 76.

The spelling of 278994853957 in words is "two hundred seventy-eight billion, nine hundred ninety-four million, eight hundred fifty-three thousand, nine hundred fifty-seven".