25215000245 has 4 divisors (see below), whose sum is σ = 30258000300. Its totient is φ = 20172000192.

The previous prime is 25215000221. The next prime is 25215000247. The reversal of 25215000245 is 54200051252.

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 5872310161 + 19342690084 = 76631^2 + 139078^2 .

It is a cyclic number.

It is not a de Polignac number, because 25215000245 - 2¹⁶ = 25214934709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215000247) 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, 2521500020 + ... + 2521500029.

It is an arithmetic number, because the mean of its divisors is an integer number (7564500075).

Almost surely, 2^25215000245 is an apocalyptic number.

It is an amenable number.

25215000245 is a deficient number, since it is larger than the sum of its proper divisors (5043000055).

25215000245 is an equidigital number, since it uses as much as digits as its factorization.

25215000245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043000054.

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 25215000245 its reverse (54200051252), we get a palindrome (79415051497).

The spelling of 25215000245 in words is "twenty-five billion, two hundred fifteen million, two hundred forty-five", and thus it is an aban number.