25550145 has 24 divisors (see below), whose sum is σ = 44701800. Its totient is φ = 13499136.

The previous prime is 25550143. The next prime is 25550149. The reversal of 25550145 is 54105552.

It can be written as a sum of positive squares in 4 ways, for example, as 11778624 + 13771521 = 3432^2 + 3711^2 .

It is not a de Polignac number, because 25550145 - 2¹ = 25550143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25550143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2301 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (1862575).

Almost surely, 2^25550145 is an apocalyptic number.

It is an amenable number.

25550145 is a deficient number, since it is larger than the sum of its proper divisors (19151655).

25550145 is a wasteful number, since it uses less digits than its factorization.

25550145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329 (or 5326 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 25550145 is about 5054.7151255041. The cubic root of 25550145 is about 294.5310753622.

Adding to 25550145 its reverse (54105552), we get a palindrome (79655697).

The spelling of 25550145 in words is "twenty-five million, five hundred fifty thousand, one hundred forty-five".