2161501604069 has 2 divisors, whose sum is σ = 2161501604070. Its totient is φ = 2161501604068.

The previous prime is 2161501604063. The next prime is 2161501604123. The reversal of 2161501604069 is 9604061051612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1830460173025 + 331041431044 = 1352945^2 + 575362^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161501604069 - 2³⁶ = 2092782127333 is a prime.

It is a super-2 number, since 2×2161501604069² (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 (2161501604063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080750802034 + 1080750802035.

It is an arithmetic number, because the mean of its divisors is an integer number (1080750802035).

Almost surely, 2^{2161501604069} is an apocalyptic number.

It is an amenable number.

2161501604069 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161501604069 is an equidigital number, since it uses as much as digits as its factorization.

2161501604069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 2161501604069 in words is "two trillion, one hundred sixty-one billion, five hundred one million, six hundred four thousand, sixty-nine".