1656013220 has 12 divisors (see below), whose sum is σ = 3477627804. Its totient is φ = 662405280.

The previous prime is 1656013217. The next prime is 1656013223. The reversal of 1656013220 is 223106561.

It is an interprime number because it is at equal distance from previous prime (1656013217) and next prime (1656013223).

It can be written as a sum of positive squares in 2 ways, for example, as 251412736 + 1404600484 = 15856^2 + 37478^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1656013220.

It is not an unprimeable number, because it can be changed into a prime (1656013223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 41400311 + ... + 41400350.

It is an arithmetic number, because the mean of its divisors is an integer number (289802317).

Almost surely, 2^1656013220 is an apocalyptic number.

1656013220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656013220 is an abundant number, since it is smaller than the sum of its proper divisors (1821614584).

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

1656013220 is a wasteful number, since it uses less digits than its factorization.

1656013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82800670 (or 82800668 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1656013220 is about 40694.1423303158. The cubic root of 1656013220 is about 1183.0994881873.

Adding to 1656013220 its reverse (223106561), we get a palindrome (1879119781).

The spelling of 1656013220 in words is "one billion, six hundred fifty-six million, thirteen thousand, two hundred twenty".