25557965 has 8 divisors (see below), whose sum is σ = 31417848. Its totient is φ = 19947520.

The previous prime is 25557947. The next prime is 25557971. The reversal of 25557965 is 56975552.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 21501769 = 2014^2 + 4637^2 .

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

It is not a de Polignac number, because 25557965 - 2¹⁰ = 25556941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62132 + ... + 62541.

It is an arithmetic number, because the mean of its divisors is an integer number (3927231).

Almost surely, 2^25557965 is an apocalyptic number.

It is an amenable number.

25557965 is a deficient number, since it is larger than the sum of its proper divisors (5859883).

25557965 is a wasteful number, since it uses less digits than its factorization.

25557965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124719.

The product of its digits is 472500, while the sum is 44.

The square root of 25557965 is about 5055.4886015102. The cubic root of 25557965 is about 294.5611208286.

The spelling of 25557965 in words is "twenty-five million, five hundred fifty-seven thousand, nine hundred sixty-five".