25023888649 has 4 divisors (see below), whose sum is σ = 26340935440. Its totient is φ = 23706841860.

The previous prime is 25023888623. The next prime is 25023888653. The reversal of 25023888649 is 94688832052.

It is a happy number.

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 25023888649 - 2¹⁹ = 25023364361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25023888649.

It is not an unprimeable number, because it can be changed into a prime (25023888689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658523367 + ... + 658523404.

It is an arithmetic number, because the mean of its divisors is an integer number (6585233860).

Almost surely, 2^25023888649 is an apocalyptic number.

It is an amenable number.

25023888649 is a deficient number, since it is larger than the sum of its proper divisors (1317046791).

25023888649 is a wasteful number, since it uses less digits than its factorization.

25023888649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317046790.

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 25023888649 in words is "twenty-five billion, twenty-three million, eight hundred eighty-eight thousand, six hundred forty-nine".