842197666851 has 24 divisors (see below), whose sum is σ = 1219029826560. Its totient is φ = 560302156656.

The previous prime is 842197666847. The next prime is 842197666897. The reversal of 842197666851 is 158666791248.

It is not a de Polignac number, because 842197666851 - 2² = 842197666847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (842197666151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9502126 + ... + 9590348.

It is an arithmetic number, because the mean of its divisors is an integer number (50792909440).

Almost surely, 2^842197666851 is an apocalyptic number.

842197666851 is a deficient number, since it is larger than the sum of its proper divisors (376832159709).

842197666851 is a wasteful number, since it uses less digits than its factorization.

842197666851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90415 (or 90412 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 842197666851 in words is "eight hundred forty-two billion, one hundred ninety-seven million, six hundred sixty-six thousand, eight hundred fifty-one".