1222556566 has 48 divisors (see below), whose sum is σ = 2341446912. Its totient is φ = 473398800.

The previous prime is 1222556557. The next prime is 1222556603. The reversal of 1222556566 is 6656552221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176631 + ... + 183421.

It is an arithmetic number, because the mean of its divisors is an integer number (48780144).

Almost surely, 2^1222556566 is an apocalyptic number.

1222556566 is a deficient number, since it is larger than the sum of its proper divisors (1118890346).

1222556566 is a wasteful number, since it uses less digits than its factorization.

1222556566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985 (or 6978 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 1222556566 is about 34965.0763762930. The cubic root of 1222556566 is about 1069.2755937597.

It can be divided in two parts, 122255 and 6566, that added together give a palindrome (128821).

The spelling of 1222556566 in words is "one billion, two hundred twenty-two million, five hundred fifty-six thousand, five hundred sixty-six".