2155666105 has 4 divisors (see below), whose sum is σ = 2586799332. Its totient is φ = 1724532880.

The previous prime is 2155666069. The next prime is 2155666111. The reversal of 2155666105 is 5016665512.

2155666105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 639887616 + 1515778489 = 25296^2 + 38933^2 .

It is not a de Polignac number, because 2155666105 - 2¹³ = 2155657913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215566606 + ... + 215566615.

It is an arithmetic number, because the mean of its divisors is an integer number (646699833).

Almost surely, 2^2155666105 is an apocalyptic number.

It is an amenable number.

2155666105 is a deficient number, since it is larger than the sum of its proper divisors (431133227).

2155666105 is an equidigital number, since it uses as much as digits as its factorization.

2155666105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431133226.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 2155666105 is about 46429.1514568164. The cubic root of 2155666105 is about 1291.7956894403.

The spelling of 2155666105 in words is "two billion, one hundred fifty-five million, six hundred sixty-six thousand, one hundred five".