8161720386876 has 144 divisors (see below), whose sum is σ = 24966411986880. Its totient is φ = 2194647275520.

The previous prime is 8161720386863. The next prime is 8161720386907. The reversal of 8161720386876 is 6786830271618.

8161720386876 is a `hidden beast` number, since 8 + 1 + 6 + 172 + 0 + 386 + 87 + 6 = 666.

It is a super-2 number, since 2×8161720386876² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 169232446 + ... + 169280666.

It is an arithmetic number, because the mean of its divisors is an integer number (173377861020).

Almost surely, 2^{8161720386876} is an apocalyptic number.

It is an amenable number.

8161720386876 is an abundant number, since it is smaller than the sum of its proper divisors (16804691600004).

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

8161720386876 is a wasteful number, since it uses less digits than its factorization.

8161720386876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87764 (or 87759 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 8161720386876 in words is "eight trillion, one hundred sixty-one billion, seven hundred twenty million, three hundred eighty-six thousand, eight hundred seventy-six".