2155267613 has 2 divisors, whose sum is σ = 2155267614. Its totient is φ = 2155267612.

The previous prime is 2155267589. The next prime is 2155267669. The reversal of 2155267613 is 3167625512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1727067364 + 428200249 = 41558^2 + 20693^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155267613 - 2²⁰ = 2154219037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155261613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077633806 + 1077633807.

It is an arithmetic number, because the mean of its divisors is an integer number (1077633807).

Almost surely, 2^2155267613 is an apocalyptic number.

It is an amenable number.

2155267613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155267613 is an equidigital number, since it uses as much as digits as its factorization.

2155267613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 2155267613 is about 46424.8598597777. The cubic root of 2155267613 is about 1291.7160849706.

The spelling of 2155267613 in words is "two billion, one hundred fifty-five million, two hundred sixty-seven thousand, six hundred thirteen".