66216502 has 32 divisors (see below), whose sum is σ = 111041280. Its totient is φ = 29362080.

The previous prime is 66216499. The next prime is 66216511. The reversal of 66216502 is 20561266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246024 + ... + 246292.

It is an arithmetic number, because the mean of its divisors is an integer number (3470040).

Almost surely, 2^66216502 is an apocalyptic number.

66216502 is a deficient number, since it is larger than the sum of its proper divisors (44824778).

66216502 is a wasteful number, since it uses less digits than its factorization.

66216502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66216502 is about 8137.3522720846. The cubic root of 66216502 is about 404.5654069067.

Adding to 66216502 its reverse (20561266), we get a palindrome (86777768).

The spelling of 66216502 in words is "sixty-six million, two hundred sixteen thousand, five hundred two".