25066639 has 4 divisors (see below), whose sum is σ = 26994856. Its totient is φ = 23138424.

The previous prime is 25066633. The next prime is 25066663. The reversal of 25066639 is 93666052.

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

It is a cyclic number.

It is not a de Polignac number, because 25066639 - 2⁵ = 25066607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25066598 and 25066607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25066633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964089 + ... + 964114.

It is an arithmetic number, because the mean of its divisors is an integer number (6748714).

Almost surely, 2^25066639 is an apocalyptic number.

25066639 is a deficient number, since it is larger than the sum of its proper divisors (1928217).

25066639 is a wasteful number, since it uses less digits than its factorization.

25066639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928216.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 25066639 is about 5006.6594651524. The cubic root of 25066639 is about 292.6613481448.

The spelling of 25066639 in words is "twenty-five million, sixty-six thousand, six hundred thirty-nine".