397666706287 has 2 divisors, whose sum is σ = 397666706288. Its totient is φ = 397666706286.

The previous prime is 397666706231. The next prime is 397666706299. The reversal of 397666706287 is 782607666793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397666706287 is a prime.

It is a super-2 number, since 2×397666706287² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397666706887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198833353143 + 198833353144.

It is an arithmetic number, because the mean of its divisors is an integer number (198833353144).

Almost surely, 2^397666706287 is an apocalyptic number.

397666706287 is a deficient number, since it is larger than the sum of its proper divisors (1).

397666706287 is an equidigital number, since it uses as much as digits as its factorization.

397666706287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192036096, while the sum is 67.

The spelling of 397666706287 in words is "three hundred ninety-seven billion, six hundred sixty-six million, seven hundred six thousand, two hundred eighty-seven".