66545074 has 4 divisors (see below), whose sum is σ = 99817614. Its totient is φ = 33272536.

The previous prime is 66545071. The next prime is 66545077. The reversal of 66545074 is 47054566.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (66545071) and next prime (66545077).

It can be written as a sum of positive squares in only one way, i.e., 35820225 + 30724849 = 5985^2 + 5543^2 .

It is not an unprimeable number, because it can be changed into a prime (66545071) 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, 16636267 + ... + 16636270.

Almost surely, 2^66545074 is an apocalyptic number.

66545074 is a deficient number, since it is larger than the sum of its proper divisors (33272540).

66545074 is a wasteful number, since it uses less digits than its factorization.

66545074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33272539.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 66545074 is about 8157.5164112615. The cubic root of 66545074 is about 405.2334659596.

The spelling of 66545074 in words is "sixty-six million, five hundred forty-five thousand, seventy-four".