667776674 has 4 divisors (see below), whose sum is σ = 1001665014. Its totient is φ = 333888336.

The previous prime is 667776671. The next prime is 667776731. The reversal of 667776674 is 476677766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 476677766 = 2 ⋅238338883.

It can be written as a sum of positive squares in only one way, i.e., 533379025 + 134397649 = 23095^2 + 11593^2 .

It is a super-3 number, since 3×667776674³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (667776671) 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, 166944167 + ... + 166944170.

Almost surely, 2^667776674 is an apocalyptic number.

667776674 is a deficient number, since it is larger than the sum of its proper divisors (333888340).

667776674 is a wasteful number, since it uses less digits than its factorization.

667776674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333888339.

The product of its digits is 12446784, while the sum is 56.

The square root of 667776674 is about 25841.3752343021. The cubic root of 667776674 is about 874.0650362578.

The spelling of 667776674 in words is "six hundred sixty-seven million, seven hundred seventy-six thousand, six hundred seventy-four".