278230978979 has 2 divisors, whose sum is σ = 278230978980. Its totient is φ = 278230978978.

The previous prime is 278230978957. The next prime is 278230978997. The reversal of 278230978979 is 979879032872.

Together with next prime (278230978997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278230978979 is a prime.

It is a super-2 number, since 2×278230978979² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278230978279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139115489489 + 139115489490.

It is an arithmetic number, because the mean of its divisors is an integer number (139115489490).

Almost surely, 2^278230978979 is an apocalyptic number.

278230978979 is a deficient number, since it is larger than the sum of its proper divisors (1).

278230978979 is an equidigital number, since it uses as much as digits as its factorization.

278230978979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192036096, while the sum is 71.

The spelling of 278230978979 in words is "two hundred seventy-eight billion, two hundred thirty million, nine hundred seventy-eight thousand, nine hundred seventy-nine".