2125864581813 has 48 divisors (see below), whose sum is σ = 3544077753216. Its totient is φ = 1202785597440.

The previous prime is 2125864581809. The next prime is 2125864581851. The reversal of 2125864581813 is 3181854685212.

2125864581813 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 8 + 6 + 458 + 181 + 3 = 666.

It is not a de Polignac number, because 2125864581813 - 2² = 2125864581809 is a prime.

It is a super-2 number, since 2×2125864581813² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2125864581813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125864582813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6758781 + ... + 7066317.

It is an arithmetic number, because the mean of its divisors is an integer number (73834953192).

Almost surely, 2^{2125864581813} is an apocalyptic number.

It is an amenable number.

2125864581813 is a deficient number, since it is larger than the sum of its proper divisors (1418213171403).

2125864581813 is a wasteful number, since it uses less digits than its factorization.

2125864581813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308634 (or 308631 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 54.

The spelling of 2125864581813 in words is "two trillion, one hundred twenty-five billion, eight hundred sixty-four million, five hundred eighty-one thousand, eight hundred thirteen".