25660516 has 48 divisors (see below), whose sum is σ = 53424000. Its totient is φ = 10776864.

The previous prime is 25660513. The next prime is 25660519. The reversal of 25660516 is 61506652.

It is an interprime number because it is at equal distance from previous prime (25660513) and next prime (25660519).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25660513) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 80790 + ... + 81106.

It is an arithmetic number, because the mean of its divisors is an integer number (1113000).

Almost surely, 2^25660516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25660516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26712000).

25660516 is an abundant number, since it is smaller than the sum of its proper divisors (27763484).

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

25660516 is a wasteful number, since it uses less digits than its factorization.

25660516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 25660516 is about 5065.6209885857. The cubic root of 25660516 is about 294.9545692751.

It can be divided in two parts, 256 and 60516, that multiplied together give a square (15492096 = 3936²).

The spelling of 25660516 in words is "twenty-five million, six hundred sixty thousand, five hundred sixteen".