2125807740217 has 6 divisors (see below), whose sum is σ = 2472878391738. Its totient is φ = 1822120920144.

The previous prime is 2125807740167. The next prime is 2125807740239. The reversal of 2125807740217 is 7120477085212.

It can be written as a sum of positive squares in only one way, i.e., 1543510549161 + 582297191056 = 1242381^2 + 763084^2 .

It is not a de Polignac number, because 2125807740217 - 2³⁵ = 2091448001849 is a prime.

It is a super-3 number, since 3×2125807740217³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2125807740817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21691915668 + ... + 21691915765.

It is an arithmetic number, because the mean of its divisors is an integer number (412146398623).

Almost surely, 2^{2125807740217} is an apocalyptic number.

It is an amenable number.

2125807740217 is a deficient number, since it is larger than the sum of its proper divisors (347070651521).

2125807740217 is an equidigital number, since it uses as much as digits as its factorization.

2125807740217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43383831447 (or 43383831440 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 2125807740217 in words is "two trillion, one hundred twenty-five billion, eight hundred seven million, seven hundred forty thousand, two hundred seventeen".