25780551 has 8 divisors (see below), whose sum is σ = 36396144. Its totient is φ = 16176000.

The previous prime is 25780529. The next prime is 25780567. The reversal of 25780551 is 15508752.

It is a happy number.

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

It is not a de Polignac number, because 25780551 - 2⁹ = 25780039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25780151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252700 + ... + 252801.

It is an arithmetic number, because the mean of its divisors is an integer number (4549518).

Almost surely, 2^25780551 is an apocalyptic number.

25780551 is a deficient number, since it is larger than the sum of its proper divisors (10615593).

25780551 is a wasteful number, since it uses less digits than its factorization.

25780551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505521.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 25780551 is about 5077.4551696692. The cubic root of 25780551 is about 295.4137677443.

It can be divided in two parts, 257 and 80551, that added together give a palindrome (80808).

The spelling of 25780551 in words is "twenty-five million, seven hundred eighty thousand, five hundred fifty-one".