66215630 has 32 divisors (see below), whose sum is σ = 128780064. Its totient is φ = 24368256.

The previous prime is 66215623. The next prime is 66215693. The reversal of 66215630 is 3651266.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66215593 and 66215602.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 50969 + ... + 52251.

It is an arithmetic number, because the mean of its divisors is an integer number (4024377).

Almost surely, 2^66215630 is an apocalyptic number.

66215630 is a deficient number, since it is larger than the sum of its proper divisors (62564434).

66215630 is a wasteful number, since it uses less digits than its factorization.

66215630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66215630 is about 8137.2986918264. The cubic root of 66215630 is about 404.5636310021.

Adding to 66215630 its reverse (3651266), we get a palindrome (69866896).

The spelling of 66215630 in words is "sixty-six million, two hundred fifteen thousand, six hundred thirty".