64571166 has 72 divisors (see below), whose sum is σ = 160589520. Its totient is φ = 18701760.

The previous prime is 64571159. The next prime is 64571173. The reversal of 64571166 is 66117546.

64571166 is a `hidden beast` number, since 645 + 7 + 1 + 1 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (64571159) and next prime (64571173).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 64571166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49450 + ... + 50738.

It is an arithmetic number, because the mean of its divisors is an integer number (2230410).

Almost surely, 2^64571166 is an apocalyptic number.

64571166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64571166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80294760).

64571166 is an abundant number, since it is smaller than the sum of its proper divisors (96018354).

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

64571166 is a wasteful number, since it uses less digits than its factorization.

64571166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1328 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64571166 is about 8035.6185822872. The cubic root of 64571166 is about 401.1864067850.

The spelling of 64571166 in words is "sixty-four million, five hundred seventy-one thousand, one hundred sixty-six".