66668071 has 8 divisors (see below), whose sum is σ = 69260400. Its totient is φ = 64095360.

The previous prime is 66668051. The next prime is 66668143. The reversal of 66668071 is 17086666.

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

It is a cyclic number.

It is not a de Polignac number, because 66668071 - 2⁷ = 66667943 is a prime.

It is a super-2 number, since 2×66668071² = 8889263381722082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220 + ... + 11758.

It is an arithmetic number, because the mean of its divisors is an integer number (8657550).

Almost surely, 2^66668071 is an apocalyptic number.

66668071 is a deficient number, since it is larger than the sum of its proper divisors (2592329).

66668071 is a wasteful number, since it uses less digits than its factorization.

66668071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9809.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66668071 is about 8165.0518063268. The cubic root of 66668071 is about 405.4829801646.

The spelling of 66668071 in words is "sixty-six million, six hundred sixty-eight thousand, seventy-one".