16503633425 has 12 divisors (see below), whose sum is σ = 20582802780. Its totient is φ = 13126585920.

The previous prime is 16503633413. The next prime is 16503633427. The reversal of 16503633425 is 52433630561.

It can be written as a sum of positive squares in 6 ways, for example, as 2103873424 + 14399760001 = 45868^2 + 119999^2 .

It is not a de Polignac number, because 16503633425 - 2¹⁶ = 16503567889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16503633427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1903610 + ... + 1912259.

It is an arithmetic number, because the mean of its divisors is an integer number (1715233565).

Almost surely, 2^16503633425 is an apocalyptic number.

It is an amenable number.

16503633425 is a deficient number, since it is larger than the sum of its proper divisors (4079169355).

16503633425 is a wasteful number, since it uses less digits than its factorization.

16503633425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3816052 (or 3816047 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 16503633425 in words is "sixteen billion, five hundred three million, six hundred thirty-three thousand, four hundred twenty-five".