66021286 has 8 divisors (see below), whose sum is σ = 99585720. Its totient is φ = 32826048.

The previous prime is 66021281. The next prime is 66021287. The reversal of 66021286 is 68212066.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66021281) 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, 91851 + ... + 92566.

It is an arithmetic number, because the mean of its divisors is an integer number (12448215).

Almost surely, 2^66021286 is an apocalyptic number.

66021286 is a deficient number, since it is larger than the sum of its proper divisors (33564434).

66021286 is a wasteful number, since it uses less digits than its factorization.

66021286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184598.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 66021286 is about 8125.3483617627. The cubic root of 66021286 is about 404.1674427637.

The spelling of 66021286 in words is "sixty-six million, twenty-one thousand, two hundred eighty-six".