8161126872 has 32 divisors (see below), whose sum is σ = 21106364400. Its totient is φ = 2626569344.

The previous prime is 8161126861. The next prime is 8161126891. The reversal of 8161126872 is 2786211618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5862183 + ... + 5863574.

Almost surely, 2^8161126872 is an apocalyptic number.

It is an amenable number.

8161126872 is an abundant number, since it is smaller than the sum of its proper divisors (12945237528).

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

8161126872 is a wasteful number, since it uses less digits than its factorization.

8161126872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11725795 (or 11725791 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 8161126872 is about 90338.9554511231. The cubic root of 8161126872 is about 2013.3380892782.

The spelling of 8161126872 in words is "eight billion, one hundred sixty-one million, one hundred twenty-six thousand, eight hundred seventy-two".