1661556222 has 24 divisors (see below), whose sum is σ = 3601241280. Its totient is φ = 553667040.

The previous prime is 1661556199. The next prime is 1661556227. The reversal of 1661556222 is 2226551661.

1661556222 is a `hidden beast` number, since 1 + 66 + 15 + 562 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661556227) 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 11 ways as a sum of consecutive naturals, for example, 46722 + ... + 74202.

It is an arithmetic number, because the mean of its divisors is an integer number (150051720).

Almost surely, 2^1661556222 is an apocalyptic number.

1661556222 is an abundant number, since it is smaller than the sum of its proper divisors (1939685058).

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

1661556222 is a wasteful number, since it uses less digits than its factorization.

1661556222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30848 (or 30845 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1661556222 is about 40762.1910843860. The cubic root of 1661556222 is about 1184.4180403663.

The spelling of 1661556222 in words is "one billion, six hundred sixty-one million, five hundred fifty-six thousand, two hundred twenty-two".