16523947903 has 4 divisors (see below), whose sum is σ = 17093739240. Its totient is φ = 15954156568.

The previous prime is 16523947901. The next prime is 16523947907. The reversal of 16523947903 is 30974932561.

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 16523947903 - 2¹ = 16523947901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16523947901) 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, 284895625 + ... + 284895682.

It is an arithmetic number, because the mean of its divisors is an integer number (4273434810).

Almost surely, 2^16523947903 is an apocalyptic number.

16523947903 is a deficient number, since it is larger than the sum of its proper divisors (569791337).

16523947903 is an equidigital number, since it uses as much as digits as its factorization.

16523947903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569791336.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 16523947903 in words is "sixteen billion, five hundred twenty-three million, nine hundred forty-seven thousand, nine hundred three".