666242405 has 8 divisors (see below), whose sum is σ = 799673472. Its totient is φ = 532872208.

The previous prime is 666242399. The next prime is 666242441. The reversal of 666242405 is 504242666.

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 666242405 - 2¹⁴ = 666226021 is a prime.

It is a super-3 number, since 3×666242405³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13952 + ... + 39078.

It is an arithmetic number, because the mean of its divisors is an integer number (99959184).

Almost surely, 2^666242405 is an apocalyptic number.

It is an amenable number.

666242405 is a deficient number, since it is larger than the sum of its proper divisors (133431067).

666242405 is a wasteful number, since it uses less digits than its factorization.

666242405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30435.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 666242405 is about 25811.6718753358. The cubic root of 666242405 is about 873.3951120598.

The spelling of 666242405 in words is "six hundred sixty-six million, two hundred forty-two thousand, four hundred five".