66250000 has 80 divisors (see below), whose sum is σ = 163476144. Its totient is φ = 26000000.

The previous prime is 66249983. The next prime is 66250027. The reversal of 66250000 is 5266.

66250000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 57032704 + 9217296 = 7552^2 + 3036^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 66250000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1249974 + ... + 1250026.

Almost surely, 2^66250000 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 66250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81738072).

66250000 is an abundant number, since it is smaller than the sum of its proper divisors (97226144).

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

66250000 is an frugal number, since it uses more digits than its factorization.

66250000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 66250000 is about 8139.4102980499. The cubic root of 66250000 is about 404.6336167283.

Adding to 66250000 its reverse (5266), we get a palindrome (66255266).

The spelling of 66250000 in words is "sixty-six million, two hundred fifty thousand".