2165319917952 has 64 divisors (see below), whose sum is σ = 6054348475200. Its totient is φ = 683785234944.

The previous prime is 2165319917939. The next prime is 2165319917953. The reversal of 2165319917952 is 2597199135612.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2165319917952² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165319917953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148383598 + ... + 148398189.

It is an arithmetic number, because the mean of its divisors is an integer number (94599194925).

Almost surely, 2^{2165319917952} is an apocalyptic number.

It is an amenable number.

2165319917952 is an abundant number, since it is smaller than the sum of its proper divisors (3889028557248).

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

2165319917952 is a wasteful number, since it uses less digits than its factorization.

2165319917952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296781823 (or 296781811 counting only the distinct ones).

The product of its digits is 9185400, while the sum is 60.

The spelling of 2165319917952 in words is "two trillion, one hundred sixty-five billion, three hundred nineteen million, nine hundred seventeen thousand, nine hundred fifty-two".