25671561 has 8 divisors (see below), whose sum is σ = 34371744. Its totient is φ = 17042880.

The previous prime is 25671553. The next prime is 25671593. The reversal of 25671561 is 16517652.

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

It is not a de Polignac number, because 25671561 - 2³ = 25671553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25671551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17031 + ... + 18476.

It is an arithmetic number, because the mean of its divisors is an integer number (4296468).

Almost surely, 2^25671561 is an apocalyptic number.

It is an amenable number.

25671561 is a deficient number, since it is larger than the sum of its proper divisors (8700183).

25671561 is a wasteful number, since it uses less digits than its factorization.

25671561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35751.

The product of its digits is 12600, while the sum is 33.

The square root of 25671561 is about 5066.7110634020. The cubic root of 25671561 is about 294.9968820890.

It can be divided in two parts, 256 and 71561, that added together give a palindrome (71817).

The spelling of 25671561 in words is "twenty-five million, six hundred seventy-one thousand, five hundred sixty-one".