16313185818 has 48 divisors (see below), whose sum is σ = 36415496520. Its totient is φ = 5274004608.

The previous prime is 16313185741. The next prime is 16313185849. The reversal of 16313185818 is 81858131361.

16313185818 is a `hidden beast` number, since 1 + 6 + 31 + 31 + 8 + 581 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14119855929 + 2193329889 = 118827^2 + 46833^2 .

It is a super-2 number, since 2×16313185818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 172488 + ... + 249756.

Almost surely, 2^16313185818 is an apocalyptic number.

16313185818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16313185818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18207748260).

16313185818 is an abundant number, since it is smaller than the sum of its proper divisors (20102310702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16313185818 is a wasteful number, since it uses less digits than its factorization.

16313185818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77631 (or 77628 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The spelling of 16313185818 in words is "sixteen billion, three hundred thirteen million, one hundred eighty-five thousand, eight hundred eighteen".