25550005 has 8 divisors (see below), whose sum is σ = 33018552. Its totient is φ = 18867648.

The previous prime is 25549991. The next prime is 25550027. The reversal of 25550005 is 50005552.

It can be written as a sum of positive squares in 4 ways, for example, as 208849 + 25341156 = 457^2 + 5034^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25550005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196474 + ... + 196603.

It is an arithmetic number, because the mean of its divisors is an integer number (4127319).

Almost surely, 2^25550005 is an apocalyptic number.

It is an amenable number.

25550005 is a deficient number, since it is larger than the sum of its proper divisors (7468547).

25550005 is a wasteful number, since it uses less digits than its factorization.

25550005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393095.

The product of its (nonzero) digits is 1250, while the sum is 22.

The square root of 25550005 is about 5054.7012770291. The cubic root of 25550005 is about 294.5305374080.

Adding to 25550005 its reverse (50005552), we get a palindrome (75555557).

The spelling of 25550005 in words is "twenty-five million, five hundred fifty thousand, five".