385663812268949 has 2 divisors, whose sum is σ = 385663812268950. Its totient is φ = 385663812268948.

The previous prime is 385663812268913. The next prime is 385663812268967. The reversal of 385663812268949 is 949862218366583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205190784568324 + 180473027700625 = 14324482^2 + 13434025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385663812268949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385663812168949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192831906134474 + 192831906134475.

It is an arithmetic number, because the mean of its divisors is an integer number (192831906134475).

Almost surely, 2^{385663812268949} is an apocalyptic number.

It is an amenable number.

385663812268949 is a deficient number, since it is larger than the sum of its proper divisors (1).

385663812268949 is an equidigital number, since it uses as much as digits as its factorization.

385663812268949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6449725440, while the sum is 80.

The spelling of 385663812268949 in words is "three hundred eighty-five trillion, six hundred sixty-three billion, eight hundred twelve million, two hundred sixty-eight thousand, nine hundred forty-nine".