25385522649 has 16 divisors (see below), whose sum is σ = 35241327744. Its totient is φ = 16240233600.

The previous prime is 25385522647. The next prime is 25385522713. The reversal of 25385522649 is 94622558352.

It is a happy number.

It is not a de Polignac number, because 25385522649 - 2¹ = 25385522647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25385522647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1684189 + ... + 1699194.

It is an arithmetic number, because the mean of its divisors is an integer number (2202582984).

Almost surely, 2^25385522649 is an apocalyptic number.

It is an amenable number.

25385522649 is a deficient number, since it is larger than the sum of its proper divisors (9855805095).

25385522649 is a wasteful number, since it uses less digits than its factorization.

25385522649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383488.

The product of its digits is 5184000, while the sum is 51.

The spelling of 25385522649 in words is "twenty-five billion, three hundred eighty-five million, five hundred twenty-two thousand, six hundred forty-nine".