66005564 has 12 divisors (see below), whose sum is σ = 117689544. Its totient is φ = 32379984.

The previous prime is 66005551. The next prime is 66005579. The reversal of 66005564 is 46550066.

It is a self number, because there is not a number n which added to its sum of digits gives 66005564.

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, 155462 + ... + 155885.

It is an arithmetic number, because the mean of its divisors is an integer number (9807462).

Almost surely, 2^66005564 is an apocalyptic number.

It is an amenable number.

66005564 is a deficient number, since it is larger than the sum of its proper divisors (51683980).

66005564 is a wasteful number, since it uses less digits than its factorization.

66005564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311404 (or 311402 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 66005564 is about 8124.3808379470. The cubic root of 66005564 is about 404.1353580358.

The spelling of 66005564 in words is "sixty-six million, five thousand, five hundred sixty-four".