25570555 has 4 divisors (see below), whose sum is σ = 30684672. Its totient is φ = 20456440.

The previous prime is 25570553. The next prime is 25570577. The reversal of 25570555 is 55507552.

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

It is not a de Polignac number, because 25570555 - 2¹ = 25570553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25570555.

It is not an unprimeable number, because it can be changed into a prime (25570553) 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, 2557051 + ... + 2557060.

It is an arithmetic number, because the mean of its divisors is an integer number (7671168).

Almost surely, 2^25570555 is an apocalyptic number.

25570555 is a deficient number, since it is larger than the sum of its proper divisors (5114117).

25570555 is an equidigital number, since it uses as much as digits as its factorization.

25570555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114116.

The product of its (nonzero) digits is 43750, while the sum is 34.

The square root of 25570555 is about 5056.7336295281. The cubic root of 25570555 is about 294.6094803874.

The spelling of 25570555 in words is "twenty-five million, five hundred seventy thousand, five hundred fifty-five".