25706661 has 8 divisors (see below), whose sum is σ = 34343424. Its totient is φ = 17103840.

The previous prime is 25706641. The next prime is 25706683. The reversal of 25706661 is 16660752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25706661 - 2¹⁰ = 25705637 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25706641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6661 + ... + 9786.

It is an arithmetic number, because the mean of its divisors is an integer number (4292928).

Almost surely, 2^25706661 is an apocalyptic number.

It is an amenable number.

25706661 is a deficient number, since it is larger than the sum of its proper divisors (8636763).

25706661 is a wasteful number, since it uses less digits than its factorization.

25706661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16971.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 25706661 is about 5070.1736656647. The cubic root of 25706661 is about 295.1312678276.

The spelling of 25706661 in words is "twenty-five million, seven hundred six thousand, six hundred sixty-one".