25543661 has 8 divisors (see below), whose sum is σ = 30009504. Its totient is φ = 21435120.

The previous prime is 25543631. The next prime is 25543663. The reversal of 25543661 is 16634552.

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

It is a cyclic number.

It is not a de Polignac number, because 25543661 - 2²² = 21349357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543663) 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, 89171 + ... + 89456.

It is an arithmetic number, because the mean of its divisors is an integer number (3751188).

Almost surely, 2^25543661 is an apocalyptic number.

It is an amenable number.

25543661 is a deficient number, since it is larger than the sum of its proper divisors (4465843).

25543661 is a wasteful number, since it uses less digits than its factorization.

25543661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178651.

The product of its digits is 21600, while the sum is 32.

The square root of 25543661 is about 5054.0737034594. The cubic root of 25543661 is about 294.5061583338.

The spelling of 25543661 in words is "twenty-five million, five hundred forty-three thousand, six hundred sixty-one".