7898166985931 has 2 divisors, whose sum is σ = 7898166985932. Its totient is φ = 7898166985930.

The previous prime is 7898166985889. The next prime is 7898166985937. The reversal of 7898166985931 is 1395896618987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7898166985931 - 2¹⁰ = 7898166984907 is a prime.

It is a super-2 number, since 2×7898166985931² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7898166985937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949083492965 + 3949083492966.

It is an arithmetic number, because the mean of its divisors is an integer number (3949083492966).

Almost surely, 2^{7898166985931} is an apocalyptic number.

7898166985931 is a deficient number, since it is larger than the sum of its proper divisors (1).

7898166985931 is an equidigital number, since it uses as much as digits as its factorization.

7898166985931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1410877440, while the sum is 80.

The spelling of 7898166985931 in words is "seven trillion, eight hundred ninety-eight billion, one hundred sixty-six million, nine hundred eighty-five thousand, nine hundred thirty-one".