666734346 has 12 divisors (see below), whose sum is σ = 1444591122. Its totient is φ = 222244776.

The previous prime is 666734287. The next prime is 666734363. The reversal of 666734346 is 643437666.

It can be written as a sum of positive squares in only one way, i.e., 542657025 + 124077321 = 23295^2 + 11139^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18520381 + ... + 18520416.

Almost surely, 2^666734346 is an apocalyptic number.

666734346 is an abundant number, since it is smaller than the sum of its proper divisors (777856776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666734346 is a wasteful number, since it uses less digits than its factorization.

666734346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37040805 (or 37040802 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 45.

The square root of 666734346 is about 25821.1995461094. The cubic root of 666734346 is about 873.6100254077.

The spelling of 666734346 in words is "six hundred sixty-six million, seven hundred thirty-four thousand, three hundred forty-six".