2156051660 has 96 divisors (see below), whose sum is σ = 5296233600. Its totient is φ = 721963008.

The previous prime is 2156051621. The next prime is 2156051669. The reversal of 2156051660 is 661506512.

2156051660 is a modest number, since divided by 51660 gives 21560 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2156051669) 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, 2054816 + ... + 2055864.

It is an arithmetic number, because the mean of its divisors is an integer number (55169100).

Almost surely, 2^2156051660 is an apocalyptic number.

2156051660 is a gapful number since it is divisible by the number (20) 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 2156051660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2648116800).

2156051660 is an abundant number, since it is smaller than the sum of its proper divisors (3140181940).

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

2156051660 is a wasteful number, since it uses less digits than its factorization.

2156051660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395 (or 1393 counting only the distinct ones).

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

The square root of 2156051660 is about 46433.3033500741. The cubic root of 2156051660 is about 1291.8727002221.

The spelling of 2156051660 in words is "two billion, one hundred fifty-six million, fifty-one thousand, six hundred sixty".