66085656 has 64 divisors (see below), whose sum is σ = 203347200. Its totient is φ = 17428608.

The previous prime is 66085639. The next prime is 66085687. The reversal of 66085656 is 65658066.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12946 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (3177300).

Almost surely, 2^66085656 is an apocalyptic number.

It is an amenable number.

66085656 is an abundant number, since it is smaller than the sum of its proper divisors (137261544).

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

66085656 is a wasteful number, since it uses less digits than its factorization.

66085656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30288 (or 30284 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 66085656 is about 8129.3084576734. The cubic root of 66085656 is about 404.2987529782.

The spelling of 66085656 in words is "sixty-six million, eighty-five thousand, six hundred fifty-six".