66500010 has 24 divisors (see below), whose sum is σ = 172900260. Its totient is φ = 17733312.

The previous prime is 66500009. The next prime is 66500011. The reversal of 66500010 is 1000566.

66500010 is a `hidden beast` number, since 6 + 650 + 0 + 0 + 10 = 666.

It is an interprime number because it is at equal distance from previous prime (66500009) and next prime (66500011).

It can be written as a sum of positive squares in 2 ways, for example, as 64979721 + 1520289 = 8061^2 + 1233^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66500011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369355 + ... + 369534.

Almost surely, 2^66500010 is an apocalyptic number.

66500010 is an abundant number, since it is smaller than the sum of its proper divisors (106400250).

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

66500010 is a wasteful number, since it uses less digits than its factorization.

66500010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738902 (or 738899 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 66500010 is about 8154.7538282894. The cubic root of 66500010 is about 405.1419712601.

Adding to 66500010 its reverse (1000566), we get a palindrome (67500576).

The spelling of 66500010 in words is "sixty-six million, five hundred thousand, ten".