2595407639681 has 4 divisors (see below), whose sum is σ = 2595413981700. Its totient is φ = 2595401297664.

The previous prime is 2595407639677. The next prime is 2595407639687. The reversal of 2595407639681 is 1869367045952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1865081862400 + 730325777281 = 1365680^2 + 854591^2 .

It is a cyclic number.

It is not a de Polignac number, because 2595407639681 - 2² = 2595407639677 is a prime.

It is a super-2 number, since 2×2595407639681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2595407639687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2511416 + ... + 3390873.

It is an arithmetic number, because the mean of its divisors is an integer number (648853495425).

It is a 1-persistent number, because it is pandigital, but 2⋅2595407639681 = 5190815279362 is not.

Almost surely, 2^{2595407639681} is an apocalyptic number.

It is an amenable number.

2595407639681 is a deficient number, since it is larger than the sum of its proper divisors (6342019).

2595407639681 is an equidigital number, since it uses as much as digits as its factorization.

2595407639681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6342018.

The product of its (nonzero) digits is 97977600, while the sum is 65.

The spelling of 2595407639681 in words is "two trillion, five hundred ninety-five billion, four hundred seven million, six hundred thirty-nine thousand, six hundred eighty-one".