666415427 has 8 divisors (see below), whose sum is σ = 673134000. Its totient is φ = 659708064.

The previous prime is 666415417. The next prime is 666415429. The reversal of 666415427 is 724514666.

It is a happy number.

666415427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 666415427 - 2¹² = 666411331 is a prime.

It is a super-3 number, since 3×666415427³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666415429) 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, 166868 + ... + 170814.

It is an arithmetic number, because the mean of its divisors is an integer number (84141750).

Almost surely, 2^666415427 is an apocalyptic number.

666415427 is a deficient number, since it is larger than the sum of its proper divisors (6718573).

666415427 is a wasteful number, since it uses less digits than its factorization.

666415427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605.

The product of its digits is 241920, while the sum is 41.

The square root of 666415427 is about 25815.0232810277. The cubic root of 666415427 is about 873.4707119156.

The spelling of 666415427 in words is "six hundred sixty-six million, four hundred fifteen thousand, four hundred twenty-seven".