220010661 has 60 divisors (see below), whose sum is σ = 365568588. Its totient is φ = 131072256.

The previous prime is 220010657. The next prime is 220010711. The reversal of 220010661 is 166010022.

It is a happy number.

220010661 is a `hidden beast` number, since 2 + 2 + 0 + 0 + 1 + 0 + 661 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14976900 + 205033761 = 3870^2 + 14319^2 .

It is not a de Polignac number, because 220010661 - 2² = 220010657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220050661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1946941 + ... + 1947053.

Almost surely, 2^220010661 is an apocalyptic number.

It is an amenable number.

220010661 is a deficient number, since it is larger than the sum of its proper divisors (145557927).

220010661 is a wasteful number, since it uses less digits than its factorization.

220010661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 220010661 is about 14832.7563520743. The cubic root of 220010661 is about 603.6908248009.

Adding to 220010661 its reverse (166010022), we get a palindrome (386020683).

The spelling of 220010661 in words is "two hundred twenty million, ten thousand, six hundred sixty-one".