25520551 has 8 divisors (see below), whose sum is σ = 30172320. Its totient is φ = 21120288.

The previous prime is 25520527. The next prime is 25520557. The reversal of 25520551 is 15502552.

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 25520551 - 2⁷ = 25520423 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 (25520557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62656 + ... + 63061.

It is an arithmetic number, because the mean of its divisors is an integer number (3771540).

Almost surely, 2^25520551 is an apocalyptic number.

25520551 is a deficient number, since it is larger than the sum of its proper divisors (4651769).

25520551 is a wasteful number, since it uses less digits than its factorization.

25520551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125753.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25520551 is about 5051.7869115789. The cubic root of 25520551 is about 294.4173157976.

The spelling of 25520551 in words is "twenty-five million, five hundred twenty thousand, five hundred fifty-one".