220433661 has 12 divisors (see below), whose sum is σ = 363890592. Its totient is φ = 125962056.

The previous prime is 220433651. The next prime is 220433683. The reversal of 220433661 is 166334022.

220433661 is a `hidden beast` number, since 220 + 433 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 220433661 - 2⁶ = 220433597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220433651) 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, 1749411 + ... + 1749536.

It is an arithmetic number, because the mean of its divisors is an integer number (30324216).

Almost surely, 2^220433661 is an apocalyptic number.

220433661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220433661 is a deficient number, since it is larger than the sum of its proper divisors (143456931).

220433661 is a wasteful number, since it uses less digits than its factorization.

220433661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498960 (or 3498957 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 220433661 is about 14847.0084865605. The cubic root of 220433661 is about 604.0774693040.

Adding to 220433661 its reverse (166334022), we get a palindrome (386767683).

The spelling of 220433661 in words is "two hundred twenty million, four hundred thirty-three thousand, six hundred sixty-one".