2165725561357 has 4 divisors (see below), whose sum is σ = 2166029359420. Its totient is φ = 2165421763296.

The previous prime is 2165725561331. The next prime is 2165725561379. The reversal of 2165725561357 is 7531655275612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 990212068836 + 1175513492521 = 995094^2 + 1084211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165725561357 - 2³¹ = 2163578077709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165725561298 and 2165725561307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165725571357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151888338 + ... + 151902595.

It is an arithmetic number, because the mean of its divisors is an integer number (541507339855).

Almost surely, 2^{2165725561357} is an apocalyptic number.

It is an amenable number.

2165725561357 is a deficient number, since it is larger than the sum of its proper divisors (303798063).

2165725561357 is an equidigital number, since it uses as much as digits as its factorization.

2165725561357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303798062.

The product of its digits is 13230000, while the sum is 55.

The spelling of 2165725561357 in words is "two trillion, one hundred sixty-five billion, seven hundred twenty-five million, five hundred sixty-one thousand, three hundred fifty-seven".