25105661 has 16 divisors (see below), whose sum is σ = 29569536. Its totient is φ = 20870016.

The previous prime is 25105657. The next prime is 25105667. The reversal of 25105661 is 16650152.

It is a cyclic number.

It is not a de Polignac number, because 25105661 - 2² = 25105657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25105661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25105667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44795 + ... + 45351.

It is an arithmetic number, because the mean of its divisors is an integer number (1848096).

Almost surely, 2^25105661 is an apocalyptic number.

It is an amenable number.

25105661 is a deficient number, since it is larger than the sum of its proper divisors (4463875).

25105661 is a wasteful number, since it uses less digits than its factorization.

25105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25105661 is about 5010.5549592835. The cubic root of 25105661 is about 292.8131343519.

The spelling of 25105661 in words is "twenty-five million, one hundred five thousand, six hundred sixty-one".