25660016 has 30 divisors (see below), whose sum is σ = 50661936. Its totient is φ = 12590400.

The previous prime is 25660009. The next prime is 25660027. The reversal of 25660016 is 61006652.

It is a super-2 number, since 2×25660016² = 1316872842240512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59321 + ... + 59751.

Almost surely, 2^25660016 is an apocalyptic number.

It is an amenable number.

25660016 is a deficient number, since it is larger than the sum of its proper divisors (25001920).

25660016 is an equidigital number, since it uses as much as digits as its factorization.

25660016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25660016 is about 5065.5716360545. The cubic root of 25660016 is about 294.9526535142.

Adding to 25660016 its reverse (61006652), we get a palindrome (86666668).

The spelling of 25660016 in words is "twenty-five million, six hundred sixty thousand, sixteen".