220406661 has 12 divisors (see below), whose sum is σ = 318494592. Its totient is φ = 146878056.

The previous prime is 220406653. The next prime is 220406687. The reversal of 220406661 is 166604022.

It is a happy number.

It is not a de Polignac number, because 220406661 - 2³ = 220406653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220406651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37270 + ... + 42776.

It is an arithmetic number, because the mean of its divisors is an integer number (26541216).

Almost surely, 2^220406661 is an apocalyptic number.

It is an amenable number.

220406661 is a deficient number, since it is larger than the sum of its proper divisors (98087931).

220406661 is a wasteful number, since it uses less digits than its factorization.

220406661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9960 (or 9957 counting only the distinct ones).

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

The square root of 220406661 is about 14846.0991846343. The cubic root of 220406661 is about 604.0528046535.

The spelling of 220406661 in words is "two hundred twenty million, four hundred six thousand, six hundred sixty-one".