66805068 has 72 divisors (see below), whose sum is σ = 173091520. Its totient is φ = 20037600.

The previous prime is 66805021. The next prime is 66805073. The reversal of 66805068 is 86050866.

It is a super-2 number, since 2×66805068² = 8925834220969248, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201663 + ... + 201993.

Almost surely, 2^66805068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66805068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86545760).

66805068 is an abundant number, since it is smaller than the sum of its proper divisors (106286452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66805068 is a wasteful number, since it uses less digits than its factorization.

66805068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 66805068 is about 8173.4367312655. The cubic root of 66805068 is about 405.7605340435.

The spelling of 66805068 in words is "sixty-six million, eight hundred five thousand, sixty-eight".