278066317957 has 2 divisors, whose sum is σ = 278066317958. Its totient is φ = 278066317956.

The previous prime is 278066317889. The next prime is 278066317987. The reversal of 278066317957 is 759713660872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182956374756 + 95109943201 = 427734^2 + 308399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278066317957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278066317895 and 278066317904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278066317987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139033158978 + 139033158979.

It is an arithmetic number, because the mean of its divisors is an integer number (139033158979).

Almost surely, 2^278066317957 is an apocalyptic number.

It is an amenable number.

278066317957 is a deficient number, since it is larger than the sum of its proper divisors (1).

278066317957 is an equidigital number, since it uses as much as digits as its factorization.

278066317957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 278066317957 in words is "two hundred seventy-eight billion, sixty-six million, three hundred seventeen thousand, nine hundred fifty-seven".