66268681 has 8 divisors (see below), whose sum is σ = 69657984. Its totient is φ = 62921760.

The previous prime is 66268679. The next prime is 66268693. The reversal of 66268681 is 18686266.

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 66268681 - 2¹ = 66268679 is a prime.

It is a super-2 number, since 2×66268681² = 8783076162959522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66268661) 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, 7365 + ... + 13666.

It is an arithmetic number, because the mean of its divisors is an integer number (8707248).

Almost surely, 2^66268681 is an apocalyptic number.

It is an amenable number.

66268681 is a deficient number, since it is larger than the sum of its proper divisors (3389303).

66268681 is a wasteful number, since it uses less digits than its factorization.

66268681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21191.

The product of its digits is 165888, while the sum is 43.

The square root of 66268681 is about 8140.5577818722. The cubic root of 66268681 is about 404.6716456602.

The spelling of 66268681 in words is "sixty-six million, two hundred sixty-eight thousand, six hundred eighty-one".