66545808 has 160 divisors (see below), whose sum is σ = 209510400. Its totient is φ = 17791488.

The previous prime is 66545779. The next prime is 66545819. The reversal of 66545808 is 80854566.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66545808.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 610458 + ... + 610566.

It is an arithmetic number, because the mean of its divisors is an integer number (1309440).

Almost surely, 2^66545808 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 66545808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104755200).

66545808 is an abundant number, since it is smaller than the sum of its proper divisors (142964592).

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

66545808 is a wasteful number, since it uses less digits than its factorization.

66545808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 66545808 is about 8157.5614003206. The cubic root of 66545808 is about 405.2349558784.

The spelling of 66545808 in words is "sixty-six million, five hundred forty-five thousand, eight hundred eight".