64166656 has 36 divisors (see below), whose sum is σ = 130832352. Its totient is φ = 31394816.

The previous prime is 64166611. The next prime is 64166657. The reversal of 64166656 is 65666146.

It is not an unprimeable number, because it can be changed into a prime (64166657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9366 + ... + 14698.

It is an arithmetic number, because the mean of its divisors is an integer number (3634232).

Almost surely, 2^64166656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64166656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65416176).

64166656 is an abundant number, since it is smaller than the sum of its proper divisors (66665696).

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

64166656 is an equidigital number, since it uses as much as digits as its factorization.

64166656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5396 (or 5382 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 64166656 is about 8010.4092279983. The cubic root of 64166656 is about 400.3468990656.

The spelling of 64166656 in words is "sixty-four million, one hundred sixty-six thousand, six hundred fifty-six".