16408400303 has 6 divisors (see below), whose sum is σ = 16993718664. Its totient is φ = 15842592584.

The previous prime is 16408400273. The next prime is 16408400321. The reversal of 16408400303 is 30300480461.

It is not a de Polignac number, because 16408400303 - 2¹⁰ = 16408399279 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16408400383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9754451 + ... + 9756132.

It is an arithmetic number, because the mean of its divisors is an integer number (2832286444).

Almost surely, 2^16408400303 is an apocalyptic number.

16408400303 is a deficient number, since it is larger than the sum of its proper divisors (585318361).

16408400303 is an equidigital number, since it uses as much as digits as its factorization.

16408400303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19510641 (or 19510612 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 16408400303 its reverse (30300480461), we get a palindrome (46708880764).

The spelling of 16408400303 in words is "sixteen billion, four hundred eight million, four hundred thousand, three hundred three".