25561503645253 has 8 divisors (see below), whose sum is σ = 25785710385120. Its totient is φ = 25338074052720.

The previous prime is 25561503645217. The next prime is 25561503645311. The reversal of 25561503645253 is 35254630516552.

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 25561503645253 - 2²¹ = 25561501548101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561503645253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561503645553) 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, 194220763 + ... + 194352328.

It is an arithmetic number, because the mean of its divisors is an integer number (3223213798140).

Almost surely, 2^{25561503645253} is an apocalyptic number.

It is an amenable number.

25561503645253 is a deficient number, since it is larger than the sum of its proper divisors (224206739867).

25561503645253 is a wasteful number, since it uses less digits than its factorization.

25561503645253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388573667.

The product of its (nonzero) digits is 16200000, while the sum is 52.

The spelling of 25561503645253 in words is "twenty-five trillion, five hundred sixty-one billion, five hundred three million, six hundred forty-five thousand, two hundred fifty-three".