220624661 has 4 divisors (see below), whose sum is σ = 222766752. Its totient is φ = 218482572.

The previous prime is 220624639. The next prime is 220624667. The reversal of 220624661 is 166426022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220624661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220624667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070891 + ... + 1071096.

It is an arithmetic number, because the mean of its divisors is an integer number (55691688).

Almost surely, 2^220624661 is an apocalyptic number.

It is an amenable number.

220624661 is a deficient number, since it is larger than the sum of its proper divisors (2142091).

220624661 is a wasteful number, since it uses less digits than its factorization.

220624661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142090.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 220624661 is about 14853.4393660189. The cubic root of 220624661 is about 604.2518913772.

The spelling of 220624661 in words is "two hundred twenty million, six hundred twenty-four thousand, six hundred sixty-one".