25165516558 has 48 divisors (see below), whose sum is σ = 46771585056. Its totient is φ = 9943464960.

The previous prime is 25165516531. The next prime is 25165516559. The reversal of 25165516558 is 85561556152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25165516559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2078410 + ... + 2090482.

It is an arithmetic number, because the mean of its divisors is an integer number (974408022).

Almost surely, 2^25165516558 is an apocalyptic number.

25165516558 is a deficient number, since it is larger than the sum of its proper divisors (21606068498).

25165516558 is a wasteful number, since it uses less digits than its factorization.

25165516558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12989 (or 12976 counting only the distinct ones).

The product of its digits is 1800000, while the sum is 49.

The spelling of 25165516558 in words is "twenty-five billion, one hundred sixty-five million, five hundred sixteen thousand, five hundred fifty-eight".