511665383993 has 2 divisors, whose sum is σ = 511665383994. Its totient is φ = 511665383992.

The previous prime is 511665383963. The next prime is 511665384017. The reversal of 511665383993 is 399383566115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506014554409 + 5650829584 = 711347^2 + 75172^2 .

It is a cyclic number.

It is not a de Polignac number, because 511665383993 - 2⁸ = 511665383737 is a prime.

It is not a weakly prime, because it can be changed into another prime (511665383963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255832691996 + 255832691997.

It is an arithmetic number, because the mean of its divisors is an integer number (255832691997).

Almost surely, 2^511665383993 is an apocalyptic number.

It is an amenable number.

511665383993 is a deficient number, since it is larger than the sum of its proper divisors (1).

511665383993 is an equidigital number, since it uses as much as digits as its factorization.

511665383993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15746400, while the sum is 59.

The spelling of 511665383993 in words is "five hundred eleven billion, six hundred sixty-five million, three hundred eighty-three thousand, nine hundred ninety-three".