397686768877 has 2 divisors, whose sum is σ = 397686768878. Its totient is φ = 397686768876.

The previous prime is 397686768827. The next prime is 397686768893. The reversal of 397686768877 is 778867686793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393102666441 + 4584102436 = 626979^2 + 67706^2 .

It is a cyclic number.

It is not a de Polignac number, because 397686768877 - 2²³ = 397678380269 is a prime.

It is a super-2 number, since 2×397686768877² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397686768877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397686768827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198843384438 + 198843384439.

It is an arithmetic number, because the mean of its divisors is an integer number (198843384439).

Almost surely, 2^397686768877 is an apocalyptic number.

It is an amenable number.

397686768877 is a deficient number, since it is larger than the sum of its proper divisors (1).

397686768877 is an equidigital number, since it uses as much as digits as its factorization.

397686768877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7169347584, while the sum is 82.

The spelling of 397686768877 in words is "three hundred ninety-seven billion, six hundred eighty-six million, seven hundred sixty-eight thousand, eight hundred seventy-seven".