66564036 has 216 divisors, whose sum is σ = 220758720. Its totient is φ = 16536960.

The previous prime is 66564023. The next prime is 66564041. The reversal of 66564036 is 63046566.

66564036 is a `hidden beast` number, since 6 + 6 + 5 + 640 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1128175 + ... + 1128233.

Almost surely, 2^66564036 is an apocalyptic number.

66564036 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66564036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110379360).

66564036 is an abundant number, since it is smaller than the sum of its proper divisors (154194684).

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

66564036 is a wasteful number, since it uses less digits than its factorization.

66564036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 66564036 is about 8158.6785694743. The cubic root of 66564036 is about 405.2719526913.

The spelling of 66564036 in words is "sixty-six million, five hundred sixty-four thousand, thirty-six".