1220162556 has 24 divisors (see below), whose sum is σ = 3014519760. Its totient is φ = 382796032.

The previous prime is 1220162551. The next prime is 1220162557. The reversal of 1220162556 is 6552610221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220162551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2990391 + ... + 2990798.

It is an arithmetic number, because the mean of its divisors is an integer number (125604990).

Almost surely, 2^1220162556 is an apocalyptic number.

It is an amenable number.

1220162556 is an abundant number, since it is smaller than the sum of its proper divisors (1794357204).

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

1220162556 is a wasteful number, since it uses less digits than its factorization.

1220162556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5981213 (or 5981211 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1220162556 is about 34930.8252980086. The cubic root of 1220162556 is about 1068.5771859425.

Adding to 1220162556 its reverse (6552610221), we get a palindrome (7772772777).

The spelling of 1220162556 in words is "one billion, two hundred twenty million, one hundred sixty-two thousand, five hundred fifty-six".