278164223 has 2 divisors, whose sum is σ = 278164224. Its totient is φ = 278164222.

The previous prime is 278164177. The next prime is 278164247. The reversal of 278164223 is 322461872.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278164223 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278169223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139082111 + 139082112.

It is an arithmetic number, because the mean of its divisors is an integer number (139082112).

Almost surely, 2^278164223 is an apocalyptic number.

278164223 is a deficient number, since it is larger than the sum of its proper divisors (1).

278164223 is an equidigital number, since it uses as much as digits as its factorization.

278164223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 278164223 is about 16678.2559939581. The cubic root of 278164223 is about 652.7803763672.

The spelling of 278164223 in words is "two hundred seventy-eight million, one hundred sixty-four thousand, two hundred twenty-three".