220410661 has 4 divisors (see below), whose sum is σ = 233376012. Its totient is φ = 207445312.

The previous prime is 220410649. The next prime is 220410667. The reversal of 220410661 is 166014022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68973025 + 151437636 = 8305^2 + 12306^2 .

It is a cyclic number.

It is not a de Polignac number, because 220410661 - 2¹⁷ = 220279589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220410667) 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 3 ways as a sum of consecutive naturals, for example, 6482650 + ... + 6482683.

It is an arithmetic number, because the mean of its divisors is an integer number (58344003).

Almost surely, 2^220410661 is an apocalyptic number.

It is an amenable number.

220410661 is a deficient number, since it is larger than the sum of its proper divisors (12965351).

220410661 is a wasteful number, since it uses less digits than its factorization.

220410661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12965350.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 220410661 is about 14846.2338995450. The cubic root of 220410661 is about 604.0564588029.

Adding to 220410661 its reverse (166014022), we get a palindrome (386424683).

It can be divided in two parts, 220 and 410661, that added together give a square (410881 = 641²).

The spelling of 220410661 in words is "two hundred twenty million, four hundred ten thousand, six hundred sixty-one".