66011250 has 80 divisors (see below), whose sum is σ = 170945280. Its totient is φ = 16968000.

The previous prime is 66011249. The next prime is 66011261. The reversal of 66011250 is 5211066.

It is a happy number.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 108447 + ... + 109053.

It is an arithmetic number, because the mean of its divisors is an integer number (2136816).

Almost surely, 2^66011250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66011250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85472640).

66011250 is an abundant number, since it is smaller than the sum of its proper divisors (104934030).

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

66011250 is a wasteful number, since it uses less digits than its factorization.

66011250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 66011250 is about 8124.7307647700. The cubic root of 66011250 is about 404.1469623487.

The spelling of 66011250 in words is "sixty-six million, eleven thousand, two hundred fifty".