25643003 has 4 divisors (see below), whose sum is σ = 25786440. Its totient is φ = 25499568.

The previous prime is 25642973. The next prime is 25643063. The reversal of 25643003 is 30034652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25643003 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 25643003.

It is not an unprimeable number, because it can be changed into a prime (25643063) 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, 71450 + ... + 71807.

It is an arithmetic number, because the mean of its divisors is an integer number (6446610).

Almost surely, 2^25643003 is an apocalyptic number.

25643003 is a deficient number, since it is larger than the sum of its proper divisors (143437).

25643003 is a wasteful number, since it uses less digits than its factorization.

25643003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143436.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 25643003 is about 5063.8920802087. The cubic root of 25643003 is about 294.8874529973.

Adding to 25643003 its reverse (30034652), we get a palindrome (55677655).

The spelling of 25643003 in words is "twenty-five million, six hundred forty-three thousand, three".