66868071 has 16 divisors (see below), whose sum is σ = 90288000. Its totient is φ = 44017568.

The previous prime is 66868057. The next prime is 66868091. The reversal of 66868071 is 17086866.

It is a cyclic number.

It is not a de Polignac number, because 66868071 - 2²⁵ = 33313639 is a prime.

It is a super-2 number, since 2×66868071² = 8942677838522082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66868001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 101140 + ... + 101798.

It is an arithmetic number, because the mean of its divisors is an integer number (5643000).

Almost surely, 2^66868071 is an apocalyptic number.

66868071 is a deficient number, since it is larger than the sum of its proper divisors (23419929).

66868071 is a wasteful number, since it uses less digits than its factorization.

66868071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66868071 is about 8177.2899545020. The cubic root of 66868071 is about 405.8880498119. Note that the first 3 decimals are identical.

The spelling of 66868071 in words is "sixty-six million, eight hundred sixty-eight thousand, seventy-one".