1656105620 has 96 divisors (see below), whose sum is σ = 3856428576. Its totient is φ = 593510400.

The previous prime is 1656105611. The next prime is 1656105623. The reversal of 1656105620 is 265016561.

It can be written as a sum of positive squares in 16 ways, for example, as 1382798596 + 273307024 = 37186^2 + 16532^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656105623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3592190 + ... + 3592650.

It is an arithmetic number, because the mean of its divisors is an integer number (40171131).

Almost surely, 2^1656105620 is an apocalyptic number.

1656105620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656105620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1928214288).

1656105620 is an abundant number, since it is smaller than the sum of its proper divisors (2200322956).

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

1656105620 is a wasteful number, since it uses less digits than its factorization.

1656105620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1656105620 is about 40695.2776130106. The cubic root of 1656105620 is about 1183.1214921098.

The spelling of 1656105620 in words is "one billion, six hundred fifty-six million, one hundred five thousand, six hundred twenty".