25115483821 has 4 divisors (see below), whose sum is σ = 25125642172. Its totient is φ = 25105325472.

The previous prime is 25115483803. The next prime is 25115483837. The reversal of 25115483821 is 12838451152.

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 19940264100 + 5175219721 = 141210^2 + 71939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25115483821 is a prime.

It is a super-3 number, since 3×25115483821³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25115483801) 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, 5075466 + ... + 5080411.

It is an arithmetic number, because the mean of its divisors is an integer number (6281410543).

Almost surely, 2^25115483821 is an apocalyptic number.

It is an amenable number.

25115483821 is a deficient number, since it is larger than the sum of its proper divisors (10158351).

25115483821 is a wasteful number, since it uses less digits than its factorization.

25115483821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10158350.

The product of its digits is 76800, while the sum is 40.

The spelling of 25115483821 in words is "twenty-five billion, one hundred fifteen million, four hundred eighty-three thousand, eight hundred twenty-one".