25899665530 has 16 divisors (see below), whose sum is σ = 46840346784. Its totient is φ = 10310766480.

The previous prime is 25899665509. The next prime is 25899665537. The reversal of 25899665530 is 3556699852.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25899665537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6135252 + ... + 6139471.

It is an arithmetic number, because the mean of its divisors is an integer number (2927521674).

Almost surely, 2^25899665530 is an apocalyptic number.

25899665530 is a deficient number, since it is larger than the sum of its proper divisors (20940681254).

25899665530 is a wasteful number, since it uses less digits than its factorization.

25899665530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12274941.

The product of its (nonzero) digits is 17496000, while the sum is 58.

The spelling of 25899665530 in words is "twenty-five billion, eight hundred ninety-nine million, six hundred sixty-five thousand, five hundred thirty".