2155123125 has 40 divisors (see below), whose sum is σ = 3989722880. Its totient is φ = 1149390000.

The previous prime is 2155123109. The next prime is 2155123151. The reversal of 2155123125 is 5213215512.

2155123125 is a `hidden beast` number, since 21 + 5 + 512 + 3 + 125 = 666.

It is not a de Polignac number, because 2155123125 - 2⁴ = 2155123109 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent 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 39 ways as a sum of consecutive naturals, for example, 46981 + ... + 80730.

It is an arithmetic number, because the mean of its divisors is an integer number (99743072).

Almost surely, 2^2155123125 is an apocalyptic number.

2155123125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2155123125 is a deficient number, since it is larger than the sum of its proper divisors (1834599755).

2155123125 is an equidigital number, since it uses as much as digits as its factorization.

2155123125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127740 (or 127719 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 2155123125 is about 46423.3036846797. The cubic root of 2155123125 is about 1291.6872190047.

Adding to 2155123125 its reverse (5213215512), we get a palindrome (7368338637).

The spelling of 2155123125 in words is "two billion, one hundred fifty-five million, one hundred twenty-three thousand, one hundred twenty-five".