2061565900 has 54 divisors (see below), whose sum is σ = 4676678972. Its totient is φ = 788752800.

The previous prime is 2061565871. The next prime is 2061565903. The reversal of 2061565900 is 95651602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2061565903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33415 + ... + 72385.

Almost surely, 2^2061565900 is an apocalyptic number.

2061565900 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 2061565900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2338339486).

2061565900 is an abundant number, since it is smaller than the sum of its proper divisors (2615113072).

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

2061565900 is a wasteful number, since it uses less digits than its factorization.

2061565900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39031 (or 39001 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 2061565900 is about 45404.4700442589. The cubic root of 2061565900 is about 1272.7186475761.

The spelling of 2061565900 in words is "two billion, sixty-one million, five hundred sixty-five thousand, nine hundred".