420642566 has 16 divisors (see below), whose sum is σ = 649893024. Its totient is φ = 204044544.

The previous prime is 420642559. The next prime is 420642581. The reversal of 420642566 is 665246024.

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, 18071 + ... + 34173.

It is an arithmetic number, because the mean of its divisors is an integer number (40618314).

Almost surely, 2^420642566 is an apocalyptic number.

420642566 is a deficient number, since it is larger than the sum of its proper divisors (229250458).

420642566 is a wasteful number, since it uses less digits than its factorization.

420642566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16495.

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

The square root of 420642566 is about 20509.5725455213. The cubic root of 420642566 is about 749.2689564059.

The spelling of 420642566 in words is "four hundred twenty million, six hundred forty-two thousand, five hundred sixty-six".