25661650 has 48 divisors (see below), whose sum is σ = 55014336. Its totient is φ = 8723520.

The previous prime is 25661639. The next prime is 25661651. The reversal of 25661650 is 5616652.

It is not an unprimeable number, because it can be changed into a prime (25661651) 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 23 ways as a sum of consecutive naturals, for example, 54717 + ... + 55183.

It is an arithmetic number, because the mean of its divisors is an integer number (1146132).

Almost surely, 2^25661650 is an apocalyptic number.

25661650 is an abundant number, since it is smaller than the sum of its proper divisors (29352686).

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

25661650 is a wasteful number, since it uses less digits than its factorization.

25661650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 638 counting only the distinct ones).

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

The square root of 25661650 is about 5065.7329183446. The cubic root of 25661650 is about 294.9589141287.

The spelling of 25661650 in words is "twenty-five million, six hundred sixty-one thousand, six hundred fifty".