66660074 has 8 divisors (see below), whose sum is σ = 107681700. Its totient is φ = 30766176.

The previous prime is 66660071. The next prime is 66660103. The reversal of 66660074 is 47006666.

It can be written as a sum of positive squares in 2 ways, for example, as 60730849 + 5929225 = 7793^2 + 2435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66660071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281899 + ... + 1281950.

Almost surely, 2^66660074 is an apocalyptic number.

66660074 is a deficient number, since it is larger than the sum of its proper divisors (41021626).

66660074 is a wasteful number, since it uses less digits than its factorization.

66660074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563864.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 66660074 is about 8164.5620825614. The cubic root of 66660074 is about 405.4667666208.

The spelling of 66660074 in words is "sixty-six million, six hundred sixty thousand, seventy-four".