278658454079 has 2 divisors, whose sum is σ = 278658454080. Its totient is φ = 278658454078.

The previous prime is 278658454033. The next prime is 278658454157. The reversal of 278658454079 is 970454856872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278658454079 - 2³⁶ = 209938977343 is a prime.

It is a super-3 number, since 3×278658454079³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278658454279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139329227039 + 139329227040.

It is an arithmetic number, because the mean of its divisors is an integer number (139329227040).

Almost surely, 2^278658454079 is an apocalyptic number.

278658454079 is a deficient number, since it is larger than the sum of its proper divisors (1).

278658454079 is an equidigital number, since it uses as much as digits as its factorization.

278658454079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135475200, while the sum is 65.

The spelling of 278658454079 in words is "two hundred seventy-eight billion, six hundred fifty-eight million, four hundred fifty-four thousand, seventy-nine".