25025127649 has 4 divisors (see below), whose sum is σ = 25045759636. Its totient is φ = 25004495664.

The previous prime is 25025127587. The next prime is 25025127671. The reversal of 25025127649 is 94672152052.

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 1041030225 + 23984097424 = 32265^2 + 154868^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025127649 - 2¹⁵ = 25025094881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25025127749) 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, 10314174 + ... + 10316599.

It is an arithmetic number, because the mean of its divisors is an integer number (6261439909).

Almost surely, 2^25025127649 is an apocalyptic number.

It is an amenable number.

25025127649 is a deficient number, since it is larger than the sum of its proper divisors (20631987).

25025127649 is a wasteful number, since it uses less digits than its factorization.

25025127649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20631986.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 25025127649 in words is "twenty-five billion, twenty-five million, one hundred twenty-seven thousand, six hundred forty-nine".