66975074 has 4 divisors (see below), whose sum is σ = 100462614. Its totient is φ = 33487536.

The previous prime is 66975067. The next prime is 66975079. The reversal of 66975074 is 47057966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47057966 = 2 ⋅23528983.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 3214849 = 7985^2 + 1793^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66975079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16743767 + ... + 16743770.

Almost surely, 2^66975074 is an apocalyptic number.

66975074 is a deficient number, since it is larger than the sum of its proper divisors (33487540).

66975074 is a wasteful number, since it uses less digits than its factorization.

66975074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33487539.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 66975074 is about 8183.8300324481. The cubic root of 66975074 is about 406.1044365595.

The spelling of 66975074 in words is "sixty-six million, nine hundred seventy-five thousand, seventy-four".