2165208135684 has 96 divisors (see below), whose sum is σ = 5846312941056. Its totient is φ = 616398881280.

The previous prime is 2165208135659. The next prime is 2165208135697. The reversal of 2165208135684 is 4865318025612.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345487 + ... + 2109449.

It is an arithmetic number, because the mean of its divisors is an integer number (60899093136).

Almost surely, 2^{2165208135684} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165208135684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2923156470528).

2165208135684 is an abundant number, since it is smaller than the sum of its proper divisors (3681104805372).

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

2165208135684 is a wasteful number, since it uses less digits than its factorization.

2165208135684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764545 (or 1764543 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 2165208135684 in words is "two trillion, one hundred sixty-five billion, two hundred eight million, one hundred thirty-five thousand, six hundred eighty-four".