2155665567 has 16 divisors (see below), whose sum is σ = 3136671360. Its totient is φ = 1305981600.

The previous prime is 2155665563. The next prime is 2155665583. The reversal of 2155665567 is 7655665512.

It is a happy number.

2155665567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2155665567 - 2² = 2155665563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155665563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92092 + ... + 113102.

It is an arithmetic number, because the mean of its divisors is an integer number (196041960).

Almost surely, 2^2155665567 is an apocalyptic number.

2155665567 is a deficient number, since it is larger than the sum of its proper divisors (981005793).

2155665567 is a wasteful number, since it uses less digits than its factorization.

2155665567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24134.

The product of its digits is 1890000, while the sum is 48.

The square root of 2155665567 is about 46429.1456630423. The cubic root of 2155665567 is about 1291.7955819737.

Subtracting 2155665567 from its reverse (7655665512), we obtain a palindrome (5499999945).

The spelling of 2155665567 in words is "two billion, one hundred fifty-five million, six hundred sixty-five thousand, five hundred sixty-seven".