420145666 has 8 divisors (see below), whose sum is σ = 650548224. Its totient is φ = 203296260.

The previous prime is 420145589. The next prime is 420145673. The reversal of 420145666 is 666541024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3388210 + ... + 3388333.

It is an arithmetic number, because the mean of its divisors is an integer number (81318528).

Almost surely, 2^420145666 is an apocalyptic number.

420145666 is a deficient number, since it is larger than the sum of its proper divisors (230402558).

420145666 is a wasteful number, since it uses less digits than its factorization.

420145666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776576.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 420145666 is about 20497.4551103302. The cubic root of 420145666 is about 748.9738060231.

The spelling of 420145666 in words is "four hundred twenty million, one hundred forty-five thousand, six hundred sixty-six".