666676774 has 4 divisors (see below), whose sum is σ = 1000015164. Its totient is φ = 333338386.

The previous prime is 666676741. The next prime is 666676783. The reversal of 666676774 is 477676666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 477676666 = 2 ⋅238838333.

It is a congruent 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 as a sum of consecutive naturals, namely, 166669192 + ... + 166669195.

It is an arithmetic number, because the mean of its divisors is an integer number (250003791).

Almost surely, 2^666676774 is an apocalyptic number.

666676774 is a deficient number, since it is larger than the sum of its proper divisors (333338390).

666676774 is a wasteful number, since it uses less digits than its factorization.

666676774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333338389.

The product of its digits is 10668672, while the sum is 55.

The square root of 666676774 is about 25820.0847016426. The cubic root of 666676774 is about 873.5848794985.

It can be divided in two parts, 66667 and 6774, that added together give a square (73441 = 271²).

The spelling of 666676774 in words is "six hundred sixty-six million, six hundred seventy-six thousand, seven hundred seventy-four".