2165440789765 has 32 divisors (see below), whose sum is σ = 2958579323136. Its totient is φ = 1506103272960.

The previous prime is 2165440789747. The next prime is 2165440789781. The reversal of 2165440789765 is 5679870445612.

It is not a de Polignac number, because 2165440789765 - 2¹⁹ = 2165440265477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165440789697 and 2165440789706.

It is a congruent number.

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, 6508027 + ... + 6832663.

It is an arithmetic number, because the mean of its divisors is an integer number (92455603848).

Almost surely, 2^{2165440789765} is an apocalyptic number.

It is an amenable number.

2165440789765 is a deficient number, since it is larger than the sum of its proper divisors (793138533371).

2165440789765 is a wasteful number, since it uses less digits than its factorization.

2165440789765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329949.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 2165440789765 in words is "two trillion, one hundred sixty-five billion, four hundred forty million, seven hundred eighty-nine thousand, seven hundred sixty-five".