6181378731816 has 32 divisors (see below), whose sum is σ = 15639632940960. Its totient is φ = 2035634762432.

The previous prime is 6181378731793. The next prime is 6181378731817.

6181378731816 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6181378731816² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6181378731816.

It is not an unprimeable number, because it can be changed into a prime (6181378731817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551548895 + ... + 1551552878.

It is an arithmetic number, because the mean of its divisors is an integer number (488738529405).

Almost surely, 2^{6181378731816} is an apocalyptic number.

It is an amenable number.

6181378731816 is an abundant number, since it is smaller than the sum of its proper divisors (9458254209144).

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

6181378731816 is a wasteful number, since it uses less digits than its factorization.

6181378731816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103101865 (or 3103101861 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 60.

The spelling of 6181378731816 in words is "six trillion, one hundred eighty-one billion, three hundred seventy-eight million, seven hundred thirty-one thousand, eight hundred sixteen".