25440255420361 has 8 divisors (see below), whose sum is σ = 26324963209800. Its totient is φ = 24556044804480.

The previous prime is 25440255420323. The next prime is 25440255420397. The reversal of 25440255420361 is 16302455204452.

It can be written as a sum of positive squares in 4 ways, for example, as 332329190400 + 25107926229961 = 576480^2 + 5010781^2 .

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 25440255420361 - 2¹⁵ = 25440255387593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440255420311) 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, 124189270 + ... + 124393951.

It is an arithmetic number, because the mean of its divisors is an integer number (3290620401225).

Almost surely, 2^{25440255420361} is an apocalyptic number.

It is an amenable number.

25440255420361 is a deficient number, since it is larger than the sum of its proper divisors (884707789439).

25440255420361 is a wasteful number, since it uses less digits than its factorization.

25440255420361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248586779.

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 25440255420361 in words is "twenty-five trillion, four hundred forty billion, two hundred fifty-five million, four hundred twenty thousand, three hundred sixty-one".