2155365911 has 2 divisors, whose sum is σ = 2155365912. Its totient is φ = 2155365910.

The previous prime is 2155365881. The next prime is 2155365913. The reversal of 2155365911 is 1195635512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155365911 is a prime.

Together with 2155365913, 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 (2155365913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077682955 + 1077682956.

It is an arithmetic number, because the mean of its divisors is an integer number (1077682956).

Almost surely, 2^2155365911 is an apocalyptic number.

2155365911 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155365911 is an equidigital number, since it uses as much as digits as its factorization.

2155365911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 38.

The square root of 2155365911 is about 46425.9185261853. The cubic root of 2155365911 is about 1291.7357223120.

The spelling of 2155365911 in words is "two billion, one hundred fifty-five million, three hundred sixty-five thousand, nine hundred eleven".