278066317906 has 16 divisors (see below), whose sum is σ = 449707003200. Its totient is φ = 128188885968.

The previous prime is 278066317889. The next prime is 278066317957. The reversal of 278066317906 is 609713660872.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6202846 + ... + 6247513.

It is an arithmetic number, because the mean of its divisors is an integer number (28106687700).

Almost surely, 2^278066317906 is an apocalyptic number.

278066317906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

278066317906 is a deficient number, since it is larger than the sum of its proper divisors (171640685294).

278066317906 is a wasteful number, since it uses less digits than its factorization.

278066317906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12451233.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 278066317906 in words is "two hundred seventy-eight billion, sixty-six million, three hundred seventeen thousand, nine hundred six".