16399423923 has 16 divisors (see below), whose sum is σ = 21975408000. Its totient is φ = 10878327936.

The previous prime is 16399423897. The next prime is 16399423927. The reversal of 16399423923 is 32932499361.

It is a happy number.

It is not a de Polignac number, because 16399423923 - 2¹³ = 16399415731 is a prime.

It is a super-2 number, since 2×16399423923² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16399423927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488236 + ... + 520742.

It is an arithmetic number, because the mean of its divisors is an integer number (1373463000).

Almost surely, 2^16399423923 is an apocalyptic number.

16399423923 is a deficient number, since it is larger than the sum of its proper divisors (5575984077).

16399423923 is a wasteful number, since it uses less digits than its factorization.

16399423923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33346.

The product of its digits is 1889568, while the sum is 51.

The spelling of 16399423923 in words is "sixteen billion, three hundred ninety-nine million, four hundred twenty-three thousand, nine hundred twenty-three".