66600043 has 4 divisors (see below), whose sum is σ = 67079320. Its totient is φ = 66120768.

The previous prime is 66600029. The next prime is 66600049. The reversal of 66600043 is 34000666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66600043 - 2⁹ = 66599531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66599990 and 66600017.

It is not an unprimeable number, because it can be changed into a prime (66600049) 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, 239430 + ... + 239707.

It is an arithmetic number, because the mean of its divisors is an integer number (16769830).

Almost surely, 2^66600043 is an apocalyptic number.

66600043 is a deficient number, since it is larger than the sum of its proper divisors (479277).

66600043 is a wasteful number, since it uses less digits than its factorization.

66600043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479276.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66600043 is about 8160.8849397599. The cubic root of 66600043 is about 405.3450151519.

The spelling of 66600043 in words is "sixty-six million, six hundred thousand, forty-three".