25788021403 has 4 divisors (see below), whose sum is σ = 25826340088. Its totient is φ = 25749702720.

The previous prime is 25788021397. The next prime is 25788021419. The reversal of 25788021403 is 30412088752.

It is a happy number.

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-25788021403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25788028403) 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, 19158333 + ... + 19159678.

It is an arithmetic number, because the mean of its divisors is an integer number (6456585022).

Almost surely, 2^25788021403 is an apocalyptic number.

25788021403 is a deficient number, since it is larger than the sum of its proper divisors (38318685).

25788021403 is an equidigital number, since it uses as much as digits as its factorization.

25788021403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38318684.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 25788021403 in words is "twenty-five billion, seven hundred eighty-eight million, twenty-one thousand, four hundred three".