8161911680 has 64 divisors (see below), whose sum is σ = 21013020000. Its totient is φ = 3013625856.

The previous prime is 8161911631. The next prime is 8161911727. The reversal of 8161911680 is 861191618.

It is a tau number, because it is divible by the number of its divisors (64).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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, 482180 + ... + 498819.

Almost surely, 2^8161911680 is an apocalyptic number.

8161911680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8161911680 is an abundant number, since it is smaller than the sum of its proper divisors (12851108320).

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

8161911680 is a wasteful number, since it uses less digits than its factorization.

8161911680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981031 (or 981019 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 8161911680 is about 90343.2990320810. The cubic root of 8161911680 is about 2013.4026242057.

The spelling of 8161911680 in words is "eight billion, one hundred sixty-one million, nine hundred eleven thousand, six hundred eighty".