1656065220 has 48 divisors (see below), whose sum is σ = 4640328000. Its totient is φ = 441298816.

The previous prime is 1656065093. The next prime is 1656065239. The reversal of 1656065220 is 225606561.

It is a happy number.

1656065220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80734 + ... + 99146.

It is an arithmetic number, because the mean of its divisors is an integer number (96673500).

Almost surely, 2^1656065220 is an apocalyptic number.

1656065220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656065220 is an abundant number, since it is smaller than the sum of its proper divisors (2984262780).

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

1656065220 is a wasteful number, since it uses less digits than its factorization.

1656065220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19924 (or 19922 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1656065220 is about 40694.7812378934. The cubic root of 1656065220 is about 1183.1118714479. Note that the first 3 decimals are identical.

The spelling of 1656065220 in words is "one billion, six hundred fifty-six million, sixty-five thousand, two hundred twenty".