25001251247 has 4 divisors (see below), whose sum is σ = 28572858576. Its totient is φ = 21429643920.

The previous prime is 25001251153. The next prime is 25001251309. The reversal of 25001251247 is 74215210052.

It is a happy number.

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 25001251247 - 2²⁰ = 25000202671 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 (25001251447) 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, 1785803654 + ... + 1785803667.

It is an arithmetic number, because the mean of its divisors is an integer number (7143214644).

Almost surely, 2^25001251247 is an apocalyptic number.

25001251247 is a deficient number, since it is larger than the sum of its proper divisors (3571607329).

25001251247 is an equidigital number, since it uses as much as digits as its factorization.

25001251247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571607328.

The product of its (nonzero) digits is 5600, while the sum is 29.

Adding to 25001251247 its reverse (74215210052), we get a palindrome (99216461299).

The spelling of 25001251247 in words is "twenty-five billion, one million, two hundred fifty-one thousand, two hundred forty-seven".