671015761991 has 2 divisors, whose sum is σ = 671015761992. Its totient is φ = 671015761990.

The previous prime is 671015761961. The next prime is 671015762047. The reversal of 671015761991 is 199167510176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671015761991 - 2²² = 671011567687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671015761961) 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, 335507880995 + 335507880996.

It is an arithmetic number, because the mean of its divisors is an integer number (335507880996).

Almost surely, 2^671015761991 is an apocalyptic number.

671015761991 is a deficient number, since it is larger than the sum of its proper divisors (1).

671015761991 is an equidigital number, since it uses as much as digits as its factorization.

671015761991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714420, while the sum is 53.

The spelling of 671015761991 in words is "six hundred seventy-one billion, fifteen million, seven hundred sixty-one thousand, nine hundred ninety-one".