16403434412423 has 4 divisors (see below), whose sum is σ = 16403442716688. Its totient is φ = 16403426108160.

The previous prime is 16403434412411. The next prime is 16403434412467. The reversal of 16403434412423 is 32421443430461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16403434412423 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 (16403434412923) 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, 703943 + ... + 5770823.

It is an arithmetic number, because the mean of its divisors is an integer number (4100860679172).

Almost surely, 2^{16403434412423} is an apocalyptic number.

16403434412423 is a deficient number, since it is larger than the sum of its proper divisors (8304265).

16403434412423 is an equidigital number, since it uses as much as digits as its factorization.

16403434412423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8304264.

The product of its (nonzero) digits is 663552, while the sum is 41.

Adding to 16403434412423 its reverse (32421443430461), we get a palindrome (48824877842884).

The spelling of 16403434412423 in words is "sixteen trillion, four hundred three billion, four hundred thirty-four million, four hundred twelve thousand, four hundred twenty-three".