1656223120 has 20 divisors (see below), whose sum is σ = 3850718940. Its totient is φ = 662489216.

The previous prime is 1656223117. The next prime is 1656223171. The reversal of 1656223120 is 213226561.

It can be written as a sum of positive squares in 2 ways, for example, as 1320014224 + 336208896 = 36332^2 + 18336^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10351315 + ... + 10351474.

It is an arithmetic number, because the mean of its divisors is an integer number (192535947).

Almost surely, 2^1656223120 is an apocalyptic number.

1656223120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656223120 is an abundant number, since it is smaller than the sum of its proper divisors (2194495820).

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

1656223120 is a wasteful number, since it uses less digits than its factorization.

1656223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20702802 (or 20702796 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1656223120 is about 40696.7212438545. The cubic root of 1656223120 is about 1183.1494721062.

Adding to 1656223120 its reverse (213226561), we get a palindrome (1869449681).

The spelling of 1656223120 in words is "one billion, six hundred fifty-six million, two hundred twenty-three thousand, one hundred twenty".