2165326820 has 48 divisors (see below), whose sum is σ = 4585448448. Its totient is φ = 858871680.

The previous prime is 2165326799. The next prime is 2165326841. The reversal of 2165326820 is 286235612.

It is an interprime number because it is at equal distance from previous prime (2165326799) and next prime (2165326841).

It is a super-3 number, since 3×2165326820³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2099705 + ... + 2100735.

It is an arithmetic number, because the mean of its divisors is an integer number (95530176).

Almost surely, 2^2165326820 is an apocalyptic number.

2165326820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165326820 is an abundant number, since it is smaller than the sum of its proper divisors (2420121628).

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

2165326820 is a wasteful number, since it uses less digits than its factorization.

2165326820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 2165326820 is about 46533.0723249604. The cubic root of 2165326820 is about 1293.7225607536.

The spelling of 2165326820 in words is "two billion, one hundred sixty-five million, three hundred twenty-six thousand, eight hundred twenty".