2128732408125 has 60 divisors (see below), whose sum is σ = 3842750448108. Its totient is φ = 1135195200000.

The previous prime is 2128732408093. The next prime is 2128732408133. The reversal of 2128732408125 is 5218042378212.

2128732408125 is a `hidden beast` number, since 2 + 1 + 287 + 3 + 240 + 8 + 125 = 666.

It can be written as a sum of positive squares in 10 ways, for example, as 2119408960761 + 9323447364 = 1455819^2 + 96558^2 .

It is not a de Polignac number, because 2128732408125 - 2⁵ = 2128732408093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 69740367 + ... + 69770883.

Almost surely, 2^{2128732408125} is an apocalyptic number.

2128732408125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2128732408125 is a deficient number, since it is larger than the sum of its proper divisors (1714018039983).

2128732408125 is a wasteful number, since it uses less digits than its factorization.

2128732408125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42944 (or 42926 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 2128732408125 in words is "two trillion, one hundred twenty-eight billion, seven hundred thirty-two million, four hundred eight thousand, one hundred twenty-five".