16399871875 has 48 divisors (see below), whose sum is σ = 21681112320. Its totient is φ = 12384000000.

The previous prime is 16399871863. The next prime is 16399871879. The reversal of 16399871875 is 57817899361.

It is not a de Polignac number, because 16399871875 - 2⁵ = 16399871843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16399871879) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3969811 + ... + 3973939.

It is an arithmetic number, because the mean of its divisors is an integer number (451689840).

Almost surely, 2^16399871875 is an apocalyptic number.

16399871875 is a deficient number, since it is larger than the sum of its proper divisors (5281240445).

16399871875 is an frugal number, since it uses more digits than its factorization.

16399871875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226 (or 4206 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 64.

The spelling of 16399871875 in words is "sixteen billion, three hundred ninety-nine million, eight hundred seventy-one thousand, eight hundred seventy-five".