66545833 has 4 divisors (see below), whose sum is σ = 67024720. Its totient is φ = 66066948.

The previous prime is 66545819. The next prime is 66545893. The reversal of 66545833 is 33854566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66545833 - 2⁹ = 66545321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66545893) 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, 239235 + ... + 239512.

It is an arithmetic number, because the mean of its divisors is an integer number (16756180).

Almost surely, 2^66545833 is an apocalyptic number.

It is an amenable number.

66545833 is a deficient number, since it is larger than the sum of its proper divisors (478887).

66545833 is a wasteful number, since it uses less digits than its factorization.

66545833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478886.

The product of its digits is 259200, while the sum is 40.

The square root of 66545833 is about 8157.5629326411. The cubic root of 66545833 is about 405.2350066247.

The spelling of 66545833 in words is "sixty-six million, five hundred forty-five thousand, eight hundred thirty-three".