666694274 has 8 divisors (see below), whose sum is σ = 1023298320. Its totient is φ = 325594836.

The previous prime is 666694267. The next prime is 666694279. The reversal of 666694274 is 472496666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666694279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3876044 + ... + 3876215.

It is an arithmetic number, because the mean of its divisors is an integer number (127912290).

Almost surely, 2^666694274 is an apocalyptic number.

666694274 is a deficient number, since it is larger than the sum of its proper divisors (356604046).

666694274 is a wasteful number, since it uses less digits than its factorization.

666694274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7752304.

The product of its digits is 2612736, while the sum is 50.

The square root of 666694274 is about 25820.4235828927. The cubic root of 666694274 is about 873.5925231834.

The spelling of 666694274 in words is "six hundred sixty-six million, six hundred ninety-four thousand, two hundred seventy-four".