25656161 has 8 divisors (see below), whose sum is σ = 25953000. Its totient is φ = 25361280.

The previous prime is 25656157. The next prime is 25656181. The reversal of 25656161 is 16165652.

It can be written as a sum of positive squares in 4 ways, for example, as 93025 + 25563136 = 305^2 + 5056^2 .

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 25656161 - 2² = 25656157 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25656101) 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, 60731 + ... + 61151.

It is an arithmetic number, because the mean of its divisors is an integer number (3244125).

Almost surely, 2^25656161 is an apocalyptic number.

It is an amenable number.

25656161 is a deficient number, since it is larger than the sum of its proper divisors (296839).

25656161 is a wasteful number, since it uses less digits than its factorization.

25656161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979.

The product of its digits is 10800, while the sum is 32.

The square root of 25656161 is about 5065.1911118930. The cubic root of 25656161 is about 294.9378821617.

The spelling of 25656161 in words is "twenty-five million, six hundred fifty-six thousand, one hundred sixty-one".