25660116 has 18 divisors (see below), whose sum is σ = 64863162. Its totient is φ = 8553360.

The previous prime is 25660097. The next prime is 25660133. The reversal of 25660116 is 61106652.

It is a happy number.

25660116 is a `hidden beast` number, since 2 + 56 + 601 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 4536900 = 4596^2 + 2130^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×25660116³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25660116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 356355 + ... + 356426.

It is an arithmetic number, because the mean of its divisors is an integer number (3603509).

Almost surely, 2^25660116 is an apocalyptic number.

It is an amenable number.

25660116 is an abundant number, since it is smaller than the sum of its proper divisors (39203046).

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

25660116 is a wasteful number, since it uses less digits than its factorization.

25660116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712791 (or 712786 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 25660116 is about 5065.5815065992. The cubic root of 25660116 is about 294.9530366683.

Adding to 25660116 its reverse (61106652), we get a palindrome (86766768).

The spelling of 25660116 in words is "twenty-five million, six hundred sixty thousand, one hundred sixteen".