2165254285541 has 2 divisors, whose sum is σ = 2165254285542. Its totient is φ = 2165254285540.

The previous prime is 2165254285529. The next prime is 2165254285577. The reversal of 2165254285541 is 1455824525612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2087675324641 + 77578960900 = 1444879^2 + 278530^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165254285541 - 2⁶ = 2165254285477 is a prime.

It is a super-2 number, since 2×2165254285541² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2165254285541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165254285591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082627142770 + 1082627142771.

It is an arithmetic number, because the mean of its divisors is an integer number (1082627142771).

Almost surely, 2^{2165254285541} is an apocalyptic number.

It is an amenable number.

2165254285541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165254285541 is an equidigital number, since it uses as much as digits as its factorization.

2165254285541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840000, while the sum is 50.

The spelling of 2165254285541 in words is "two trillion, one hundred sixty-five billion, two hundred fifty-four million, two hundred eighty-five thousand, five hundred forty-one".