66765674 has 4 divisors (see below), whose sum is σ = 100148514. Its totient is φ = 33382836.

The previous prime is 66765667. The next prime is 66765683. The reversal of 66765674 is 47656766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47656766 = 2 ⋅23828383.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 4592449 = 7885^2 + 2143^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16691417 + ... + 16691420.

Almost surely, 2^66765674 is an apocalyptic number.

66765674 is a deficient number, since it is larger than the sum of its proper divisors (33382840).

66765674 is a wasteful number, since it uses less digits than its factorization.

66765674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382839.

The product of its digits is 1270080, while the sum is 47.

The square root of 66765674 is about 8171.0264961019. The cubic root of 66765674 is about 405.6807612861.

The spelling of 66765674 in words is "sixty-six million, seven hundred sixty-five thousand, six hundred seventy-four".