669399274 has 4 divisors (see below), whose sum is σ = 1004098914. Its totient is φ = 334699636.

The previous prime is 669399271. The next prime is 669399281. The reversal of 669399274 is 472993966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472993966 = 2 ⋅236496983.

It can be written as a sum of positive squares in only one way, i.e., 650607049 + 18792225 = 25507^2 + 4335^2 .

It is not an unprimeable number, because it can be changed into a prime (669399271) by changing a digit.

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 as a sum of consecutive naturals, namely, 167349817 + ... + 167349820.

Almost surely, 2^669399274 is an apocalyptic number.

669399274 is a deficient number, since it is larger than the sum of its proper divisors (334699640).

669399274 is a wasteful number, since it uses less digits than its factorization.

669399274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334699639.

The product of its digits is 4408992, while the sum is 55.

The square root of 669399274 is about 25872.7515738083. The cubic root of 669399274 is about 874.7724138443.

The spelling of 669399274 in words is "six hundred sixty-nine million, three hundred ninety-nine thousand, two hundred seventy-four".