16315778181 has 8 divisors (see below), whose sum is σ = 21755023264. Its totient is φ = 10876859280.

The previous prime is 16315778179. The next prime is 16315778191. The reversal of 16315778181 is 18187751361.

16315778181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16315778181 - 2¹ = 16315778179 is a prime.

It is a super-2 number, since 2×16315778181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16315778181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16315778191) 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 7 ways as a sum of consecutive naturals, for example, 82071 + ... + 198411.

It is an arithmetic number, because the mean of its divisors is an integer number (2719377908).

Almost surely, 2^16315778181 is an apocalyptic number.

It is an amenable number.

16315778181 is a deficient number, since it is larger than the sum of its proper divisors (5439245083).

16315778181 is a wasteful number, since it uses less digits than its factorization.

16315778181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163091.

The product of its digits is 282240, while the sum is 48.

The spelling of 16315778181 in words is "sixteen billion, three hundred fifteen million, seven hundred seventy-eight thousand, one hundred eighty-one".