66217630 has 16 divisors (see below), whose sum is σ = 119399040. Its totient is φ = 26440992.

The previous prime is 66217589. The next prime is 66217633. The reversal of 66217630 is 3671266.

It is a junction number, because it is equal to n+sod(n) for n = 66217592 and 66217601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66217633) 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, 616 + ... + 11524.

It is an arithmetic number, because the mean of its divisors is an integer number (7462440).

Almost surely, 2^66217630 is an apocalyptic number.

66217630 is a deficient number, since it is larger than the sum of its proper divisors (53181410).

66217630 is a wasteful number, since it uses less digits than its factorization.

66217630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11523.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66217630 is about 8137.4215818034. The cubic root of 66217630 is about 404.5677041548.

Adding to 66217630 its reverse (3671266), we get a palindrome (69888896).

The spelling of 66217630 in words is "sixty-six million, two hundred seventeen thousand, six hundred thirty".