1220663646 has 24 divisors (see below), whose sum is σ = 2649152064. Its totient is φ = 406213920.

The previous prime is 1220663593. The next prime is 1220663651. The reversal of 1220663646 is 6463660221.

1220663646 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 6 + 6 + 3 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1220663646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44935 + ... + 66786.

It is an arithmetic number, because the mean of its divisors is an integer number (110381336).

Almost surely, 2^1220663646 is an apocalyptic number.

1220663646 is an abundant number, since it is smaller than the sum of its proper divisors (1428488418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220663646 is a wasteful number, since it uses less digits than its factorization.

1220663646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112336 (or 112333 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 1220663646 is about 34937.9971664090. The cubic root of 1220663646 is about 1068.7234451594.

The spelling of 1220663646 in words is "one billion, two hundred twenty million, six hundred sixty-three thousand, six hundred forty-six".