25640159 has 8 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 25156600.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640159 is 95104652.

It is a happy number.

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 25640159 - 2¹² = 25636063 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 (25640189) 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, 16214 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (3265920).

Almost surely, 2^25640159 is an apocalyptic number.

25640159 is a deficient number, since it is larger than the sum of its proper divisors (487201).

25640159 is a wasteful number, since it uses less digits than its factorization.

25640159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821.

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

The square root of 25640159 is about 5063.6112607506. The cubic root of 25640159 is about 294.8765508561.

The spelling of 25640159 in words is "twenty-five million, six hundred forty thousand, one hundred fifty-nine".