220140666 has 40 divisors (see below), whose sum is σ = 494270964. Its totient is φ = 73232640.

The previous prime is 220140647. The next prime is 220140671. The reversal of 220140666 is 666041022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 211266225 + 8874441 = 14535^2 + 2979^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 104746 + ... + 106826.

Almost surely, 2^220140666 is an apocalyptic number.

220140666 is an abundant number, since it is smaller than the sum of its proper divisors (274130298).

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

220140666 is a wasteful number, since it uses less digits than its factorization.

220140666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748 (or 2739 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 220140666 is about 14837.1380663523. The cubic root of 220140666 is about 603.8097089977.

Adding to 220140666 its reverse (666041022), we get a palindrome (886181688).

The spelling of 220140666 in words is "two hundred twenty million, one hundred forty thousand, six hundred sixty-six".