666894274 has 16 divisors (see below), whose sum is σ = 1038786840. Its totient is φ = 320855040.

The previous prime is 666894271. The next prime is 666894313. The reversal of 666894274 is 472498666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 402604225 + 264290049 = 20065^2 + 16257^2 .

It is not an unprimeable number, because it can be changed into a prime (666894271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49719 + ... + 61690.

Almost surely, 2^666894274 is an apocalyptic number.

666894274 is a deficient number, since it is larger than the sum of its proper divisors (371892566).

666894274 is a wasteful number, since it uses less digits than its factorization.

666894274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111525.

The product of its digits is 3483648, while the sum is 52.

The square root of 666894274 is about 25824.2961956372. The cubic root of 666894274 is about 873.6798700845.

The spelling of 666894274 in words is "six hundred sixty-six million, eight hundred ninety-four thousand, two hundred seventy-four".