25531315540321 has 4 divisors (see below), whose sum is σ = 25531327108144. Its totient is φ = 25531303972500.

The previous prime is 25531315540273. The next prime is 25531315540331. The reversal of 25531315540321 is 12304551313552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25531315540321 - 2¹⁵ = 25531315507553 is a prime.

It is a super-3 number, since 3×25531315540321³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25531315540331) 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, 1330035 + ... + 7268536.

It is an arithmetic number, because the mean of its divisors is an integer number (6382831777036).

Almost surely, 2^{25531315540321} is an apocalyptic number.

It is an amenable number.

25531315540321 is a deficient number, since it is larger than the sum of its proper divisors (11567823).

25531315540321 is an equidigital number, since it uses as much as digits as its factorization.

25531315540321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11567822.

The product of its (nonzero) digits is 270000, while the sum is 40.

Adding to 25531315540321 its reverse (12304551313552), we get a palindrome (37835866853873).

The spelling of 25531315540321 in words is "twenty-five trillion, five hundred thirty-one billion, three hundred fifteen million, five hundred forty thousand, three hundred twenty-one".