66215010 has 64 divisors (see below), whose sum is σ = 163897344. Its totient is φ = 17112000.

The previous prime is 66215003. The next prime is 66215011. The reversal of 66215010 is 1051266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66215011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212755 + ... + 213065.

It is an arithmetic number, because the mean of its divisors is an integer number (2560896).

Almost surely, 2^66215010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66215010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81948672).

66215010 is an abundant number, since it is smaller than the sum of its proper divisors (97682334).

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

66215010 is a wasteful number, since it uses less digits than its factorization.

66215010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 66215010 is about 8137.2605955567. The cubic root of 66215010 is about 404.5623683081.

Adding to 66215010 its reverse (1051266), we get a palindrome (67266276).

The spelling of 66215010 in words is "sixty-six million, two hundred fifteen thousand, ten".