8397817855212 has 24 divisors (see below), whose sum is σ = 20446860865536. Its totient is φ = 2677565113168.

The previous prime is 8397817855211. The next prime is 8397817855331. The reversal of 8397817855212 is 2125587187938.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8397817855211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15213437868 + ... + 15213438419.

It is an arithmetic number, because the mean of its divisors is an integer number (851952536064).

Almost surely, 2^{8397817855212} is an apocalyptic number.

It is an amenable number.

8397817855212 is an abundant number, since it is smaller than the sum of its proper divisors (12049043010324).

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

8397817855212 is a wasteful number, since it uses less digits than its factorization.

8397817855212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30426876317 (or 30426876315 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 66.

The spelling of 8397817855212 in words is "eight trillion, three hundred ninety-seven billion, eight hundred seventeen million, eight hundred fifty-five thousand, two hundred twelve".