25221502513 has 4 divisors (see below), whose sum is σ = 25229104960. Its totient is φ = 25213900068.

The previous prime is 25221502483. The next prime is 25221502517. The reversal of 25221502513 is 31520512252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25221502513 - 2²⁵ = 25187948081 is a prime.

It is a super-2 number, since 2×25221502513² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25221502517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3796245 + ... + 3802882.

It is an arithmetic number, because the mean of its divisors is an integer number (6307276240).

Almost surely, 2^25221502513 is an apocalyptic number.

It is an amenable number.

25221502513 is a deficient number, since it is larger than the sum of its proper divisors (7602447).

25221502513 is an equidigital number, since it uses as much as digits as its factorization.

25221502513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602446.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 25221502513 in words is "twenty-five billion, two hundred twenty-one million, five hundred two thousand, five hundred thirteen".