16231988641 has 4 divisors (see below), whose sum is σ = 17707623984. Its totient is φ = 14756353300.

The previous prime is 16231988623. The next prime is 16231988677. The reversal of 16231988641 is 14688913261.

It is a happy number.

16231988641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16231988641 - 2¹⁷ = 16231857569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16231988611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737817655 + ... + 737817676.

It is an arithmetic number, because the mean of its divisors is an integer number (4426905996).

Almost surely, 2^16231988641 is an apocalyptic number.

16231988641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16231988641 is a deficient number, since it is larger than the sum of its proper divisors (1475635343).

16231988641 is a wasteful number, since it uses less digits than its factorization.

16231988641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475635342.

The product of its digits is 497664, while the sum is 49.

The spelling of 16231988641 in words is "sixteen billion, two hundred thirty-one million, nine hundred eighty-eight thousand, six hundred forty-one".