16400660403 has 4 divisors (see below), whose sum is σ = 21867547208. Its totient is φ = 10933773600.

The previous prime is 16400660363. The next prime is 16400660417. The reversal of 16400660403 is 30406600461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16400660403 - 2¹⁶ = 16400594867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16400660443) 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, 2733443398 + ... + 2733443403.

It is an arithmetic number, because the mean of its divisors is an integer number (5466886802).

Almost surely, 2^16400660403 is an apocalyptic number.

16400660403 is a deficient number, since it is larger than the sum of its proper divisors (5466886805).

16400660403 is an equidigital number, since it uses as much as digits as its factorization.

16400660403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466886804.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 16400660403 in words is "sixteen billion, four hundred million, six hundred sixty thousand, four hundred three".