25521616 has 10 divisors (see below), whose sum is σ = 49448162. Its totient is φ = 12760800.

The previous prime is 25521583. The next prime is 25521619. The reversal of 25521616 is 61612552.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 5271616 = 4500^2 + 2296^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 797535 + ... + 797566.

Almost surely, 2^25521616 is an apocalyptic number.

It is an amenable number.

25521616 is a deficient number, since it is larger than the sum of its proper divisors (23926546).

25521616 is a wasteful number, since it uses less digits than its factorization.

25521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595109 (or 1595103 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 25521616 is about 5051.8923187257. The cubic root of 25521616 is about 294.4214111909.

The spelling of 25521616 in words is "twenty-five million, five hundred twenty-one thousand, six hundred sixteen".