25515313421401 has 8 divisors (see below), whose sum is σ = 25534611001800. Its totient is φ = 25496018745600.

The previous prime is 25515313421363. The next prime is 25515313421413. The reversal of 25515313421401 is 10412431351552.

It can be written as a sum of positive squares in 4 ways, for example, as 4314344410000 + 21200969011401 = 2077100^2 + 4604451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25515313421401 - 2²¹ = 25515311324249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25515313421431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17013051 + ... + 18451951.

It is an arithmetic number, because the mean of its divisors is an integer number (3191826375225).

Almost surely, 2^{25515313421401} is an apocalyptic number.

It is an amenable number.

25515313421401 is a deficient number, since it is larger than the sum of its proper divisors (19297580399).

25515313421401 is a wasteful number, since it uses less digits than its factorization.

25515313421401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452299.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 25515313421401 its reverse (10412431351552), we get a palindrome (35927744772953).

The spelling of 25515313421401 in words is "twenty-five trillion, five hundred fifteen billion, three hundred thirteen million, four hundred twenty-one thousand, four hundred one".