812172100005 has 48 divisors (see below), whose sum is σ = 1678825324800. Its totient is φ = 355136120064.

The previous prime is 812172100001. The next prime is 812172100039. The reversal of 812172100005 is 500001271218.

812172100005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 812172100005 - 2² = 812172100001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812172100001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56043280 + ... + 56057769.

It is an arithmetic number, because the mean of its divisors is an integer number (34975527600).

Almost surely, 2^812172100005 is an apocalyptic number.

It is an amenable number.

812172100005 is an abundant number, since it is smaller than the sum of its proper divisors (866653224795).

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

812172100005 is a wasteful number, since it uses less digits than its factorization.

812172100005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112101090 (or 112101087 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The spelling of 812172100005 in words is "eight hundred twelve billion, one hundred seventy-two million, one hundred thousand, five".