25545355615501 has 4 divisors (see below), whose sum is σ = 26426229947100. Its totient is φ = 24664481283904.

The previous prime is 25545355615489. The next prime is 25545355615531. The reversal of 25545355615501 is 10551655354552.

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 8437287899401 + 17108067716100 = 2904701^2 + 4136190^2 .

It is a cyclic number.

It is not a de Polignac number, because 25545355615501 - 2⁵ = 25545355615469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25545355615531) 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, 440437165756 + ... + 440437165813.

It is an arithmetic number, because the mean of its divisors is an integer number (6606557486775).

Almost surely, 2^{25545355615501} is an apocalyptic number.

It is an amenable number.

25545355615501 is a deficient number, since it is larger than the sum of its proper divisors (880874331599).

25545355615501 is an equidigital number, since it uses as much as digits as its factorization.

25545355615501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880874331598.

The product of its (nonzero) digits is 11250000, while the sum is 52.

The spelling of 25545355615501 in words is "twenty-five trillion, five hundred forty-five billion, three hundred fifty-five million, six hundred fifteen thousand, five hundred one".