25555815535 has 4 divisors (see below), whose sum is σ = 30666978648. Its totient is φ = 20444652424.

The previous prime is 25555815533. The next prime is 25555815541. The reversal of 25555815535 is 53551855552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25555815535 - 2¹ = 25555815533 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 (25555815533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2555581549 + ... + 2555581558.

It is an arithmetic number, because the mean of its divisors is an integer number (7666744662).

Almost surely, 2^25555815535 is an apocalyptic number.

25555815535 is a deficient number, since it is larger than the sum of its proper divisors (5111163113).

25555815535 is an equidigital number, since it uses as much as digits as its factorization.

25555815535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111163112.

The product of its digits is 3750000, while the sum is 49.

The spelling of 25555815535 in words is "twenty-five billion, five hundred fifty-five million, eight hundred fifteen thousand, five hundred thirty-five".