25642553 has 4 divisors (see below), whose sum is σ = 25661328. Its totient is φ = 25623780.

The previous prime is 25642541. The next prime is 25642567. The reversal of 25642553 is 35524652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25642553 - 2⁶ = 25642489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25642523) 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, 7163 + ... + 10128.

It is an arithmetic number, because the mean of its divisors is an integer number (6415332).

Almost surely, 2^25642553 is an apocalyptic number.

It is an amenable number.

25642553 is a deficient number, since it is larger than the sum of its proper divisors (18775).

25642553 is a wasteful number, since it uses less digits than its factorization.

25642553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18774.

The product of its digits is 36000, while the sum is 32.

The square root of 25642553 is about 5063.8476477872. The cubic root of 25642553 is about 294.8857280287.

The spelling of 25642553 in words is "twenty-five million, six hundred forty-two thousand, five hundred fifty-three".