25661516 has 12 divisors (see below), whose sum is σ = 45056088. Its totient is φ = 12788352.

The previous prime is 25661513. The next prime is 25661527. The reversal of 25661516 is 61516652.

It is not an unprimeable number, because it can be changed into a prime (25661513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221 + ... + 11676.

It is an arithmetic number, because the mean of its divisors is an integer number (3754674).

Almost surely, 2^25661516 is an apocalyptic number.

It is an amenable number.

25661516 is a deficient number, since it is larger than the sum of its proper divisors (19394572).

25661516 is a wasteful number, since it uses less digits than its factorization.

25661516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21208 (or 21206 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 25661516 is about 5065.7196922056. The cubic root of 25661516 is about 294.9584007223.

The spelling of 25661516 in words is "twenty-five million, six hundred sixty-one thousand, five hundred sixteen".