66145250 has 16 divisors (see below), whose sum is σ = 123824376. Its totient is φ = 26458000.

The previous prime is 66145241. The next prime is 66145253. The reversal of 66145250 is 5254166.

It can be written as a sum of positive squares in 4 ways, for example, as 17884441 + 48260809 = 4229^2 + 6947^2 .

It is not an unprimeable number, because it can be changed into a prime (66145253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132041 + ... + 132540.

Almost surely, 2^66145250 is an apocalyptic number.

66145250 is a deficient number, since it is larger than the sum of its proper divisors (57679126).

66145250 is a wasteful number, since it uses less digits than its factorization.

66145250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264598 (or 264588 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 66145250 is about 8132.9730111442. The cubic root of 66145250 is about 404.4202445021.

The spelling of 66145250 in words is "sixty-six million, one hundred forty-five thousand, two hundred fifty".