1661655222 has 40 divisors (see below), whose sum is σ = 3919311000. Its totient is φ = 524732256.

The previous prime is 1661655197. The next prime is 1661655223. The reversal of 1661655222 is 2225561661.

1661655222 is a `hidden beast` number, since 16 + 61 + 65 + 522 + 2 = 666.

It is a super-2 number, since 2×1661655222² = 5522196153599738568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661655223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 266847 + ... + 273002.

It is an arithmetic number, because the mean of its divisors is an integer number (97982775).

Almost surely, 2^1661655222 is an apocalyptic number.

1661655222 is an abundant number, since it is smaller than the sum of its proper divisors (2257655778).

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

1661655222 is a wasteful number, since it uses less digits than its factorization.

1661655222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539882 (or 539873 counting only the distinct ones).

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

The square root of 1661655222 is about 40763.4054269267. The cubic root of 1661655222 is about 1184.4415635060.

The spelling of 1661655222 in words is "one billion, six hundred sixty-one million, six hundred fifty-five thousand, two hundred twenty-two".