65641566 has 8 divisors (see below), whose sum is σ = 131283144. Its totient is φ = 21880520.

The previous prime is 65641553. The next prime is 65641619. The reversal of 65641566 is 66514656.

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

65641566 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, 5470125 + ... + 5470136.

It is an arithmetic number, because the mean of its divisors is an integer number (16410393).

Almost surely, 2^65641566 is an apocalyptic number.

65641566 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.

65641566 is a wasteful number, since it uses less digits than its factorization.

65641566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10940266.

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

The square root of 65641566 is about 8101.9482842092. The cubic root of 65641566 is about 403.3910990429.

The spelling of 65641566 in words is "sixty-five million, six hundred forty-one thousand, five hundred sixty-six".