1565661222 has 96 divisors (see below), whose sum is σ = 3592723680. Its totient is φ = 492065280.

The previous prime is 1565661203. The next prime is 1565661233. The reversal of 1565661222 is 2221665651.

1565661222 is a `hidden beast` number, since 1 + 565 + 66 + 12 + 22 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6897073 + ... + 6897299.

It is an arithmetic number, because the mean of its divisors is an integer number (37424205).

Almost surely, 2^1565661222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1565661222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796361840).

1565661222 is an abundant number, since it is smaller than the sum of its proper divisors (2027062458).

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

1565661222 is a wasteful number, since it uses less digits than its factorization.

1565661222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 515 counting only the distinct ones).

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

The square root of 1565661222 is about 39568.4371943093. The cubic root of 1565661222 is about 1161.1792461844.

The spelling of 1565661222 in words is "one billion, five hundred sixty-five million, six hundred sixty-one thousand, two hundred twenty-two".