666705338 has 24 divisors (see below), whose sum is σ = 1103364828. Its totient is φ = 301896192.

The previous prime is 666705271. The next prime is 666705341. The reversal of 666705338 is 833507666.

It can be written as a sum of positive squares in 6 ways, for example, as 142157929 + 524547409 = 11923^2 + 22903^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 695 + ... + 36522.

Almost surely, 2^666705338 is an apocalyptic number.

666705338 is a deficient number, since it is larger than the sum of its proper divisors (436659490).

666705338 is a wasteful number, since it uses less digits than its factorization.

666705338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37298 (or 37285 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 666705338 is about 25820.6378310064. The cubic root of 666705338 is about 873.5973556704.

The spelling of 666705338 in words is "six hundred sixty-six million, seven hundred five thousand, three hundred thirty-eight".