64561566 has 8 divisors (see below), whose sum is σ = 129123144. Its totient is φ = 21520520.

The previous prime is 64561547. The next prime is 64561573. The reversal of 64561566 is 66516546.

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

64561566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380125 + ... + 5380136.

It is an arithmetic number, because the mean of its divisors is an integer number (16140393).

Almost surely, 2^64561566 is an apocalyptic number.

64561566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64561566 is a wasteful number, since it uses less digits than its factorization.

64561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10760266.

The product of its digits is 129600, while the sum is 39.

The square root of 64561566 is about 8035.0212196360. The cubic root of 64561566 is about 401.1665239145.

The spelling of 64561566 in words is "sixty-four million, five hundred sixty-one thousand, five hundred sixty-six".