2161066600 has 144 divisors (see below), whose sum is σ = 6376466880. Its totient is φ = 673545600.

The previous prime is 2161066543. The next prime is 2161066613. The reversal of 2161066600 is 66601612.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 97777 + ... + 117823.

It is an arithmetic number, because the mean of its divisors is an integer number (44281020).

Almost surely, 2^2161066600 is an apocalyptic number.

2161066600 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 2161066600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3188233440).

2161066600 is an abundant number, since it is smaller than the sum of its proper divisors (4215400280).

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

2161066600 is a wasteful number, since it uses less digits than its factorization.

2161066600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20088 (or 20072 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2161066600 is about 46487.2735272784. The cubic root of 2161066600 is about 1292.8735493811.

The spelling of 2161066600 in words is "two billion, one hundred sixty-one million, sixty-six thousand, six hundred".