671365536533 has 2 divisors, whose sum is σ = 671365536534. Its totient is φ = 671365536532.

The previous prime is 671365536497. The next prime is 671365536557. The reversal of 671365536533 is 335635563176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620324786449 + 51040750084 = 787607^2 + 225922^2 .

It is a cyclic number.

It is not a de Polignac number, because 671365536533 - 2⁸ = 671365536277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671365536563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335682768266 + 335682768267.

It is an arithmetic number, because the mean of its divisors is an integer number (335682768267).

Almost surely, 2^671365536533 is an apocalyptic number.

It is an amenable number.

671365536533 is a deficient number, since it is larger than the sum of its proper divisors (1).

671365536533 is an equidigital number, since it uses as much as digits as its factorization.

671365536533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309000, while the sum is 53.

The spelling of 671365536533 in words is "six hundred seventy-one billion, three hundred sixty-five million, five hundred thirty-six thousand, five hundred thirty-three".