25663551 has 8 divisors (see below), whose sum is σ = 34946304. Its totient is φ = 16744920.

The previous prime is 25663541. The next prime is 25663559. The reversal of 25663551 is 15536652.

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

It is not a de Polignac number, because 25663551 - 2¹⁹ = 25139263 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25663559) 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, 90865 + ... + 91146.

It is an arithmetic number, because the mean of its divisors is an integer number (4368288).

Almost surely, 2^25663551 is an apocalyptic number.

25663551 is a deficient number, since it is larger than the sum of its proper divisors (9282753).

25663551 is a wasteful number, since it uses less digits than its factorization.

25663551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182061.

The product of its digits is 27000, while the sum is 33.

The square root of 25663551 is about 5065.9205481334. The cubic root of 25663551 is about 294.9661974100.

It can be divided in two parts, 256635 and 51, that added together give a triangular number (256686 = T₇₁₆).

The spelling of 25663551 in words is "twenty-five million, six hundred sixty-three thousand, five hundred fifty-one".