421415666 has 16 divisors (see below), whose sum is σ = 724322304. Its totient is φ = 180132864.

The previous prime is 421415653. The next prime is 421415689. The reversal of 421415666 is 666514124.

It is a Curzon 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, 33935 + ... + 44658.

It is an arithmetic number, because the mean of its divisors is an integer number (45270144).

Almost surely, 2^421415666 is an apocalyptic number.

421415666 is a deficient number, since it is larger than the sum of its proper divisors (302906638).

421415666 is a wasteful number, since it uses less digits than its factorization.

421415666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78985.

The product of its digits is 34560, while the sum is 35.

The square root of 421415666 is about 20528.4111903479. The cubic root of 421415666 is about 749.7277032253.

The spelling of 421415666 in words is "four hundred twenty-one million, four hundred fifteen thousand, six hundred sixty-six".