2156181160709 has 2 divisors, whose sum is σ = 2156181160710. Its totient is φ = 2156181160708.

The previous prime is 2156181160699. The next prime is 2156181160711. The reversal of 2156181160709 is 9070611816512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1107240585025 + 1048940575684 = 1052255^2 + 1024178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156181160709 is a prime.

Together with 2156181160711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156181160739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078090580354 + 1078090580355.

It is an arithmetic number, because the mean of its divisors is an integer number (1078090580355).

Almost surely, 2^{2156181160709} is an apocalyptic number.

It is an amenable number.

2156181160709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156181160709 is an equidigital number, since it uses as much as digits as its factorization.

2156181160709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 2156181160709 in words is "two trillion, one hundred fifty-six billion, one hundred eighty-one million, one hundred sixty thousand, seven hundred nine".