671550651791 has 2 divisors, whose sum is σ = 671550651792. Its totient is φ = 671550651790.

The previous prime is 671550651727. The next prime is 671550651839. The reversal of 671550651791 is 197156055176.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671550651791 - 2⁶ = 671550651727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671550651701) 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, 335775325895 + 335775325896.

It is an arithmetic number, because the mean of its divisors is an integer number (335775325896).

Almost surely, 2^671550651791 is an apocalyptic number.

671550651791 is a deficient number, since it is larger than the sum of its proper divisors (1).

671550651791 is an equidigital number, since it uses as much as digits as its factorization.

671550651791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1984500, while the sum is 53.

The spelling of 671550651791 in words is "six hundred seventy-one billion, five hundred fifty million, six hundred fifty-one thousand, seven hundred ninety-one".