197991585767 has 2 divisors, whose sum is σ = 197991585768. Its totient is φ = 197991585766.

The previous prime is 197991585733. The next prime is 197991585821. The reversal of 197991585767 is 767585199791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197991585767 - 2⁶ = 197991585703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197991585694 and 197991585703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197991585667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98995792883 + 98995792884.

It is an arithmetic number, because the mean of its divisors is an integer number (98995792884).

Almost surely, 2^197991585767 is an apocalyptic number.

197991585767 is a deficient number, since it is larger than the sum of its proper divisors (1).

197991585767 is an equidigital number, since it uses as much as digits as its factorization.

197991585767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300056400, while the sum is 74.

The spelling of 197991585767 in words is "one hundred ninety-seven billion, nine hundred ninety-one million, five hundred eighty-five thousand, seven hundred sixty-seven".