25552551 has 4 divisors (see below), whose sum is σ = 34070072. Its totient is φ = 17035032.

The previous prime is 25552493. The next prime is 25552561. The reversal of 25552551 is 15525552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25552551 - 2¹⁵ = 25519783 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 (25552561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4258756 + ... + 4258761.

It is an arithmetic number, because the mean of its divisors is an integer number (8517518).

Almost surely, 2^25552551 is an apocalyptic number.

25552551 is a deficient number, since it is larger than the sum of its proper divisors (8517521).

25552551 is an equidigital number, since it uses as much as digits as its factorization.

25552551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517520.

The product of its digits is 12500, while the sum is 30.

The square root of 25552551 is about 5054.9531155096. The cubic root of 25552551 is about 294.5403201828.

The spelling of 25552551 in words is "twenty-five million, five hundred fifty-two thousand, five hundred fifty-one".