66805530 has 32 divisors (see below), whose sum is σ = 174909888. Its totient is φ = 16195200.

The previous prime is 66805477. The next prime is 66805537. The reversal of 66805530 is 3550866.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66805491 and 66805500.

It is not an unprimeable number, because it can be changed into a prime (66805537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100891 + ... + 101550.

It is an arithmetic number, because the mean of its divisors is an integer number (5465934).

Almost surely, 2^66805530 is an apocalyptic number.

66805530 is an abundant number, since it is smaller than the sum of its proper divisors (108104358).

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

66805530 is a wasteful number, since it uses less digits than its factorization.

66805530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202462.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 66805530 is about 8173.4649935018. The cubic root of 66805530 is about 405.7614694064.

The spelling of 66805530 in words is "sixty-six million, eight hundred five thousand, five hundred thirty".