66685534 has 8 divisors (see below), whose sum is σ = 100390248. Its totient is φ = 33222120.

The previous prime is 66685519. The next prime is 66685609. The reversal of 66685534 is 43558666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59632 + ... + 60739.

It is an arithmetic number, because the mean of its divisors is an integer number (12548781).

Almost surely, 2^66685534 is an apocalyptic number.

66685534 is a deficient number, since it is larger than the sum of its proper divisors (33704714).

66685534 is a wasteful number, since it uses less digits than its factorization.

66685534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120650.

The product of its digits is 518400, while the sum is 43.

The square root of 66685534 is about 8166.1211110294. The cubic root of 66685534 is about 405.5183810744.

The spelling of 66685534 in words is "sixty-six million, six hundred eighty-five thousand, five hundred thirty-four".