6645222210 has 64 divisors (see below), whose sum is σ = 17406264960. Its totient is φ = 1610234880.

The previous prime is 6645222173. The next prime is 6645222247. The reversal of 6645222210 is 122225466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6645222173) and next prime (6645222247).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1249036 + ... + 1254344.

It is an arithmetic number, because the mean of its divisors is an integer number (271972890).

Almost surely, 2^6645222210 is an apocalyptic number.

6645222210 is an abundant number, since it is smaller than the sum of its proper divisors (10761042750).

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

6645222210 is a wasteful number, since it uses less digits than its factorization.

6645222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6645222210 is about 81518.2323777939. The cubic root of 6645222210 is about 1880.0518895064.

Adding to 6645222210 its reverse (122225466), we get a palindrome (6767447676).

The spelling of 6645222210 in words is "six billion, six hundred forty-five million, two hundred twenty-two thousand, two hundred ten".