2156253420709 has 2 divisors, whose sum is σ = 2156253420710. Its totient is φ = 2156253420708.

The previous prime is 2156253420691. The next prime is 2156253420749. The reversal of 2156253420709 is 9070243526512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1336000781025 + 820252639684 = 1155855^2 + 905678^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156253420709 - 2⁹ = 2156253420197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156253420749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078126710354 + 1078126710355.

It is an arithmetic number, because the mean of its divisors is an integer number (1078126710355).

Almost surely, 2^{2156253420709} is an apocalyptic number.

It is an amenable number.

2156253420709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156253420709 is an equidigital number, since it uses as much as digits as its factorization.

2156253420709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 2156253420709 in words is "two trillion, one hundred fifty-six billion, two hundred fifty-three million, four hundred twenty thousand, seven hundred nine".