8161712631820 has 24 divisors (see below), whose sum is σ = 18697741666128. Its totient is φ = 2967895502400.

The previous prime is 8161712631803. The next prime is 8161712631823. The reversal of 8161712631820 is 281362171618.

It is a super-2 number, since 2×8161712631820² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161712631823) 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, 18549346671 + ... + 18549347110.

It is an arithmetic number, because the mean of its divisors is an integer number (779072569422).

Almost surely, 2^{8161712631820} is an apocalyptic number.

It is an amenable number.

8161712631820 is an abundant number, since it is smaller than the sum of its proper divisors (10536029034308).

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

8161712631820 is a wasteful number, since it uses less digits than its factorization.

8161712631820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37098693801 (or 37098693799 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 8161712631820 in words is "eight trillion, one hundred sixty-one billion, seven hundred twelve million, six hundred thirty-one thousand, eight hundred twenty".