25521516 has 36 divisors (see below), whose sum is σ = 66090024. Its totient is φ = 8299200.

The previous prime is 25521497. The next prime is 25521521. The reversal of 25521516 is 61512552.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25521516.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7170 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (1835834).

Almost surely, 2^25521516 is an apocalyptic number.

It is an amenable number.

25521516 is an abundant number, since it is smaller than the sum of its proper divisors (40568508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25521516 is a wasteful number, since it uses less digits than its factorization.

25521516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17342 (or 17337 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 25521516 is about 5051.8824214346. The cubic root of 25521516 is about 294.4210266517.

The spelling of 25521516 in words is "twenty-five million, five hundred twenty-one thousand, five hundred sixteen".