66868369 has 8 divisors (see below), whose sum is σ = 68140800. Its totient is φ = 65607216.

The previous prime is 66868349. The next prime is 66868379. The reversal of 66868369 is 96386866.

It is a happy number.

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 66868369 - 2²³ = 58479761 is a prime.

It is a super-2 number, since 2×66868369² = 8942757545440322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66868349) 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, 9664 + ... + 15070.

It is an arithmetic number, because the mean of its divisors is an integer number (8517600).

Almost surely, 2^66868369 is an apocalyptic number.

It is an amenable number.

66868369 is a deficient number, since it is larger than the sum of its proper divisors (1272431).

66868369 is a wasteful number, since it uses less digits than its factorization.

66868369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639.

The product of its digits is 2239488, while the sum is 52.

The square root of 66868369 is about 8177.3081756774. The cubic root of 66868369 is about 405.8886527627. Note that the first 3 decimals are identical.

The spelling of 66868369 in words is "sixty-six million, eight hundred sixty-eight thousand, three hundred sixty-nine".