2155104505 has 12 divisors (see below), whose sum is σ = 2630722212. Its totient is φ = 1694848160.

The previous prime is 2155104493. The next prime is 2155104527. The reversal of 2155104505 is 5054015512.

2155104505 = 3401² + 3402² + ... + 3577².

It can be written as a sum of positive squares in 2 ways, for example, as 468852409 + 1686252096 = 21653^2 + 41064^2 .

It is not a de Polignac number, because 2155104505 - 2⁷ = 2155104377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44506 + ... + 79315.

It is an arithmetic number, because the mean of its divisors is an integer number (219226851).

Almost surely, 2^2155104505 is an apocalyptic number.

It is an amenable number.

2155104505 is a deficient number, since it is larger than the sum of its proper divisors (475617707).

2155104505 is an equidigital number, since it uses as much as digits as its factorization.

2155104505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123944 (or 123885 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 2155104505 is about 46423.1031384159. The cubic root of 2155104505 is about 1291.6834989875.

The spelling of 2155104505 in words is "two billion, one hundred fifty-five million, one hundred four thousand, five hundred five".