391915980550063 has 2 divisors, whose sum is σ = 391915980550064. Its totient is φ = 391915980550062.

The previous prime is 391915980550027. The next prime is 391915980550079. The reversal of 391915980550063 is 360055089519193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391915980550063 - 2²⁵ = 391915946995631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391915980549977 and 391915980550004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391915980556063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195957990275031 + 195957990275032.

It is an arithmetic number, because the mean of its divisors is an integer number (195957990275032).

Almost surely, 2^{391915980550063} is an apocalyptic number.

391915980550063 is a deficient number, since it is larger than the sum of its proper divisors (1).

391915980550063 is an equidigital number, since it uses as much as digits as its factorization.

391915980550063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366000, while the sum is 64.

The spelling of 391915980550063 in words is "three hundred ninety-one trillion, nine hundred fifteen billion, nine hundred eighty million, five hundred fifty thousand, sixty-three".