66385834 has 4 divisors (see below), whose sum is σ = 99578754. Its totient is φ = 33192916.

The previous prime is 66385831. The next prime is 66385853. The reversal of 66385834 is 43858366.

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

It can be written as a sum of positive squares in only one way, i.e., 60886809 + 5499025 = 7803^2 + 2345^2 .

It is not an unprimeable number, because it can be changed into a prime (66385831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16596457 + ... + 16596460.

Almost surely, 2^66385834 is an apocalyptic number.

66385834 is a deficient number, since it is larger than the sum of its proper divisors (33192920).

66385834 is a wasteful number, since it uses less digits than its factorization.

66385834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33192919.

The product of its digits is 414720, while the sum is 43.

The square root of 66385834 is about 8147.7502416311. The cubic root of 66385834 is about 404.9099713519.

The spelling of 66385834 in words is "sixty-six million, three hundred eighty-five thousand, eight hundred thirty-four".