16381720811 has 8 divisors (see below), whose sum is σ = 16429724160. Its totient is φ = 16333745472.

The previous prime is 16381720787. The next prime is 16381720837. The reversal of 16381720811 is 11802718361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16381720811 - 2¹⁰ = 16381719787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16381720111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875791 + ... + 1884503.

It is an arithmetic number, because the mean of its divisors is an integer number (2053715520).

Almost surely, 2^16381720811 is an apocalyptic number.

16381720811 is a deficient number, since it is larger than the sum of its proper divisors (48003349).

16381720811 is an equidigital number, since it uses as much as digits as its factorization.

16381720811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14005.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 16381720811 in words is "sixteen billion, three hundred eighty-one million, seven hundred twenty thousand, eight hundred eleven".