25550505 has 32 divisors (see below), whose sum is σ = 46293120. Its totient is φ = 13366080.

The previous prime is 25550501. The next prime is 25550509. The reversal of 25550505 is 50505552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25550501) and next prime (25550509).

It is not a de Polignac number, because 25550505 - 2² = 25550501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25550501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5370 + ... + 8940.

It is an arithmetic number, because the mean of its divisors is an integer number (1446660).

Almost surely, 2^25550505 is an apocalyptic number.

It is an amenable number.

25550505 is a deficient number, since it is larger than the sum of its proper divisors (20742615).

25550505 is a wasteful number, since it uses less digits than its factorization.

25550505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638 (or 3632 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 27.

The square root of 25550505 is about 5054.7507356941. The cubic root of 25550505 is about 294.5324586640.

The spelling of 25550505 in words is "twenty-five million, five hundred fifty thousand, five hundred five".