25640161 has 8 divisors (see below), whose sum is σ = 26409600. Its totient is φ = 24882000.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640161 is 16104652.

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 25640161 - 2⁷ = 25640033 is a prime.

It is a super-2 number, since 2×25640161² = 1314835712211842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1911 + ... + 7411.

It is an arithmetic number, because the mean of its divisors is an integer number (3301200).

Almost surely, 2^25640161 is an apocalyptic number.

It is an amenable number.

25640161 is a deficient number, since it is larger than the sum of its proper divisors (769439).

25640161 is an equidigital number, since it uses as much as digits as its factorization.

25640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25640161 is about 5063.6114582381. The cubic root of 25640161 is about 294.8765585231.

The spelling of 25640161 in words is "twenty-five million, six hundred forty thousand, one hundred sixty-one".