25505999 has 8 divisors (see below), whose sum is σ = 26906880. Its totient is φ = 24111000.

The previous prime is 25505989. The next prime is 25506049. The reversal of 25505999 is 99950552.

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

It is not a de Polignac number, because 25505999 - 2¹⁶ = 25440463 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 (25505929) 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, 9674 + ... + 12024.

It is an arithmetic number, because the mean of its divisors is an integer number (3363360).

Almost surely, 2^25505999 is an apocalyptic number.

25505999 is a deficient number, since it is larger than the sum of its proper divisors (1400881).

25505999 is a wasteful number, since it uses less digits than its factorization.

25505999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941.

The product of its (nonzero) digits is 182250, while the sum is 44.

The square root of 25505999 is about 5050.3464237614. The cubic root of 25505999 is about 294.3613455410.

The spelling of 25505999 in words is "twenty-five million, five hundred five thousand, nine hundred ninety-nine".