2155523145 has 16 divisors (see below), whose sum is σ = 3505376832. Its totient is φ = 1130765760.

The previous prime is 2155523119. The next prime is 2155523173. The reversal of 2155523145 is 5413255512.

It is not a de Polignac number, because 2155523145 - 2⁶ = 2155523081 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1176967 + ... + 1178796.

It is an arithmetic number, because the mean of its divisors is an integer number (219086052).

Almost surely, 2^2155523145 is an apocalyptic number.

It is an amenable number.

2155523145 is a deficient number, since it is larger than the sum of its proper divisors (1349853687).

2155523145 is a wasteful number, since it uses less digits than its factorization.

2155523145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355832.

The product of its digits is 30000, while the sum is 33.

The square root of 2155523145 is about 46427.6118812932. The cubic root of 2155523145 is about 1291.7671322665.

Adding to 2155523145 its reverse (5413255512), we get a palindrome (7568778657).

The spelling of 2155523145 in words is "two billion, one hundred fifty-five million, five hundred twenty-three thousand, one hundred forty-five".