397801066828393 has 2 divisors, whose sum is σ = 397801066828394. Its totient is φ = 397801066828392.

The previous prime is 397801066828391. The next prime is 397801066828409. The reversal of 397801066828393 is 393828660108793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362069807409424 + 35731259418969 = 19028132^2 + 5977563^2 .

It is a cyclic number.

It is not a de Polignac number, because 397801066828393 - 2¹ = 397801066828391 is a prime.

It is a super-2 number, since 2×397801066828393² (a number of 30 digits) contains 22 as substring.

Together with 397801066828391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (397801066828391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198900533414196 + 198900533414197.

It is an arithmetic number, because the mean of its divisors is an integer number (198900533414197).

Almost surely, 2^{397801066828393} is an apocalyptic number.

It is an amenable number.

397801066828393 is a deficient number, since it is larger than the sum of its proper divisors (1).

397801066828393 is an equidigital number, since it uses as much as digits as its factorization.

397801066828393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564350976, while the sum is 73.

The spelling of 397801066828393 in words is "three hundred ninety-seven trillion, eight hundred one billion, sixty-six million, eight hundred twenty-eight thousand, three hundred ninety-three".