25643260303 has 8 divisors (see below), whose sum is σ = 26783382528. Its totient is φ = 24505237944.

The previous prime is 25643260289. The next prime is 25643260361. The reversal of 25643260303 is 30306234652.

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

It is not a de Polignac number, because 25643260303 - 2²¹ = 25641163151 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 (25643260393) 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, 499975 + ... + 548872.

It is an arithmetic number, because the mean of its divisors is an integer number (3347922816).

Almost surely, 2^25643260303 is an apocalyptic number.

25643260303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25643260303 is a deficient number, since it is larger than the sum of its proper divisors (1140122225).

25643260303 is a wasteful number, since it uses less digits than its factorization.

25643260303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049933.

The product of its (nonzero) digits is 77760, while the sum is 34.

Adding to 25643260303 its reverse (30306234652), we get a palindrome (55949494955).

The spelling of 25643260303 in words is "twenty-five billion, six hundred forty-three million, two hundred sixty thousand, three hundred three".