2156225265769 has 2 divisors, whose sum is σ = 2156225265770. Its totient is φ = 2156225265768.

The previous prime is 2156225265767. The next prime is 2156225265787. The reversal of 2156225265769 is 9675625226512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2119828257369 + 36397008400 = 1455963^2 + 190780^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156225265769 - 2¹ = 2156225265767 is a prime.

It is a super-2 number, since 2×2156225265769² (a number of 25 digits) contains 22 as substring.

Together with 2156225265767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2156225265767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078112632884 + 1078112632885.

It is an arithmetic number, because the mean of its divisors is an integer number (1078112632885).

Almost surely, 2^{2156225265769} is an apocalyptic number.

It is an amenable number.

2156225265769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156225265769 is an equidigital number, since it uses as much as digits as its factorization.

2156225265769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 58.

The spelling of 2156225265769 in words is "two trillion, one hundred fifty-six billion, two hundred twenty-five million, two hundred sixty-five thousand, seven hundred sixty-nine".