66105250 has 32 divisors (see below), whose sum is σ = 124321392. Its totient is φ = 26320000.

The previous prime is 66105229. The next prime is 66105253. The reversal of 66105250 is 5250166.

It can be written as a sum of positive squares in 8 ways, for example, as 6953769 + 59151481 = 2637^2 + 7691^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66105253) 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, 69780 + ... + 70720.

Almost surely, 2^66105250 is an apocalyptic number.

66105250 is a deficient number, since it is larger than the sum of its proper divisors (58216142).

66105250 is a wasteful number, since it uses less digits than its factorization.

66105250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66105250 is about 8130.5135139178. The cubic root of 66105250 is about 404.3387064137.

The spelling of 66105250 in words is "sixty-six million, one hundred five thousand, two hundred fifty".