66666074 has 4 divisors (see below), whose sum is σ = 99999114. Its totient is φ = 33333036.

The previous prime is 66666071. The next prime is 66666097. The reversal of 66666074 is 47066666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53655625 + 13010449 = 7325^2 + 3607^2 .

It is not an unprimeable number, because it can be changed into a prime (66666071) 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, 16666517 + ... + 16666520.

Almost surely, 2^66666074 is an apocalyptic number.

66666074 is a deficient number, since it is larger than the sum of its proper divisors (33333040).

66666074 is a wasteful number, since it uses less digits than its factorization.

66666074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333039.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 66666074 is about 8164.9295159236. The cubic root of 66666074 is about 405.4789314619.

The spelling of 66666074 in words is "sixty-six million, six hundred sixty-six thousand, seventy-four".