420551665 has 16 divisors (see below), whose sum is σ = 528048000. Its totient is φ = 320931072.

The previous prime is 420551639. The next prime is 420551669. The reversal of 420551665 is 566155024.

It is a cyclic number.

It is not a de Polignac number, because 420551665 - 2⁵ = 420551633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420551665.

It is not an unprimeable number, because it can be changed into a prime (420551669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38761 + ... + 48409.

It is an arithmetic number, because the mean of its divisors is an integer number (33003000).

Almost surely, 2^420551665 is an apocalyptic number.

It is an amenable number.

420551665 is a deficient number, since it is larger than the sum of its proper divisors (107496335).

420551665 is a wasteful number, since it uses less digits than its factorization.

420551665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10056.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 420551665 is about 20507.3563630225. The cubic root of 420551665 is about 749.2149800932.

The spelling of 420551665 in words is "four hundred twenty million, five hundred fifty-one thousand, six hundred sixty-five".