2165546620 has 48 divisors (see below), whose sum is σ = 4723246080. Its totient is φ = 833397824.

The previous prime is 2165546599. The next prime is 2165546627. The reversal of 2165546620 is 266455612.

It is a self number, because there is not a number n which added to its sum of digits gives 2165546620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165546627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35937 + ... + 74983.

It is an arithmetic number, because the mean of its divisors is an integer number (98400960).

Almost surely, 2^2165546620 is an apocalyptic number.

2165546620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165546620 is an abundant number, since it is smaller than the sum of its proper divisors (2557699460).

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

2165546620 is a wasteful number, since it uses less digits than its factorization.

2165546620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39162 (or 39160 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2165546620 is about 46535.4340261268. The cubic root of 2165546620 is about 1293.7663340684.

The spelling of 2165546620 in words is "two billion, one hundred sixty-five million, five hundred forty-six thousand, six hundred twenty".