2165298480181 has 2 divisors, whose sum is σ = 2165298480182. Its totient is φ = 2165298480180.

The previous prime is 2165298480151. The next prime is 2165298480193. The reversal of 2165298480181 is 1810848925612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1648386371025 + 516912109156 = 1283895^2 + 718966^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165298480181 - 2¹³ = 2165298471989 is a prime.

It is a super-2 number, since 2×2165298480181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165298480131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082649240090 + 1082649240091.

It is an arithmetic number, because the mean of its divisors is an integer number (1082649240091).

Almost surely, 2^{2165298480181} is an apocalyptic number.

It is an amenable number.

2165298480181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165298480181 is an equidigital number, since it uses as much as digits as its factorization.

2165298480181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 55.

The spelling of 2165298480181 in words is "two trillion, one hundred sixty-five billion, two hundred ninety-eight million, four hundred eighty thousand, one hundred eighty-one".