25661530 has 32 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 9891840.

The previous prime is 25661527. The next prime is 25661561. The reversal of 25661530 is 3516652.

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 15 ways as a sum of consecutive naturals, for example, 32986 + ... + 33754.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^25661530 is an apocalyptic number.

25661530 is a deficient number, since it is larger than the sum of its proper divisors (22238630).

25661530 is a wasteful number, since it uses less digits than its factorization.

25661530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25661530 is about 5065.7210740427. The cubic root of 25661530 is about 294.9584543619.

It can be divided in two parts, 2566 and 1530, that added together give a 12-th power (4096 = 2¹²).

The spelling of 25661530 in words is "twenty-five million, six hundred sixty-one thousand, five hundred thirty".