505212640397 has 2 divisors, whose sum is σ = 505212640398. Its totient is φ = 505212640396.

The previous prime is 505212640381. The next prime is 505212640403. The reversal of 505212640397 is 793046212505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420897322756 + 84315317641 = 648766^2 + 290371^2 .

It is a cyclic number.

It is not a de Polignac number, because 505212640397 - 2⁴ = 505212640381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505212640307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252606320198 + 252606320199.

It is an arithmetic number, because the mean of its divisors is an integer number (252606320199).

Almost surely, 2^505212640397 is an apocalyptic number.

It is an amenable number.

505212640397 is a deficient number, since it is larger than the sum of its proper divisors (1).

505212640397 is an equidigital number, since it uses as much as digits as its factorization.

505212640397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 505212640397 in words is "five hundred five billion, two hundred twelve million, six hundred forty thousand, three hundred ninety-seven".