666469805 has 8 divisors (see below), whose sum is σ = 804232800. Its totient is φ = 530196496.

The previous prime is 666469787. The next prime is 666469807. The reversal of 666469805 is 508964666.

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 666469805 - 2⁸ = 666469549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666469807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371435 + ... + 373224.

It is an arithmetic number, because the mean of its divisors is an integer number (100529100).

Almost surely, 2^666469805 is an apocalyptic number.

It is an amenable number.

666469805 is a deficient number, since it is larger than the sum of its proper divisors (137762995).

666469805 is a wasteful number, since it uses less digits than its factorization.

666469805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744843.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The square root of 666469805 is about 25816.0764834628. The cubic root of 666469805 is about 873.4944690180.

The spelling of 666469805 in words is "six hundred sixty-six million, four hundred sixty-nine thousand, eight hundred five".