66605933 has 4 divisors (see below), whose sum is σ = 66625020. Its totient is φ = 66586848.

The previous prime is 66605921. The next prime is 66605939. The reversal of 66605933 is 33950666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7038409 + 59567524 = 2653^2 + 7718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66605933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605939) 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, 2648 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (16656255).

Almost surely, 2^66605933 is an apocalyptic number.

It is an amenable number.

66605933 is a deficient number, since it is larger than the sum of its proper divisors (19087).

66605933 is a wasteful number, since it uses less digits than its factorization.

66605933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19086.

The product of its (nonzero) digits is 87480, while the sum is 38.

The square root of 66605933 is about 8161.2457995088. The cubic root of 66605933 is about 405.3569641520.

The spelling of 66605933 in words is "sixty-six million, six hundred five thousand, nine hundred thirty-three".