420561166 has 16 divisors (see below), whose sum is σ = 655707024. Its totient is φ = 202129344.

The previous prime is 420561157. The next prime is 420561173. The reversal of 420561166 is 661165024.

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, 28095 + ... + 40378.

It is an arithmetic number, because the mean of its divisors is an integer number (40981689).

Almost surely, 2^420561166 is an apocalyptic number.

420561166 is a deficient number, since it is larger than the sum of its proper divisors (235145858).

420561166 is a wasteful number, since it uses less digits than its factorization.

420561166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68595.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 420561166 is about 20507.5880102951. The cubic root of 420561166 is about 749.2206220777.

The spelling of 420561166 in words is "four hundred twenty million, five hundred sixty-one thousand, one hundred sixty-six".