66345434 has 4 divisors (see below), whose sum is σ = 99518154. Its totient is φ = 33172716.

The previous prime is 66345427. The next prime is 66345437. The reversal of 66345434 is 43454366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43454366 = 2 ⋅21727183.

It can be written as a sum of positive squares in only one way, i.e., 40284409 + 26061025 = 6347^2 + 5105^2 .

It is a super-2 number, since 2×66345434² = 8803433225296712, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66345394 and 66345403.

It is not an unprimeable number, because it can be changed into a prime (66345437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16586357 + ... + 16586360.

Almost surely, 2^66345434 is an apocalyptic number.

66345434 is a deficient number, since it is larger than the sum of its proper divisors (33172720).

66345434 is a wasteful number, since it uses less digits than its factorization.

66345434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33172719.

The product of its digits is 103680, while the sum is 35.

The square root of 66345434 is about 8145.2706523479. The cubic root of 66345434 is about 404.8278168652.

The spelling of 66345434 in words is "sixty-six million, three hundred forty-five thousand, four hundred thirty-four".