641391397967 has 2 divisors, whose sum is σ = 641391397968. Its totient is φ = 641391397966.

The previous prime is 641391397961. The next prime is 641391397991. The reversal of 641391397967 is 769793193146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641391397967 - 2⁸ = 641391397711 is a prime.

It is a super-2 number, since 2×641391397967² (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 (641391397961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320695698983 + 320695698984.

It is an arithmetic number, because the mean of its divisors is an integer number (320695698984).

Almost surely, 2^641391397967 is an apocalyptic number.

641391397967 is a deficient number, since it is larger than the sum of its proper divisors (1).

641391397967 is an equidigital number, since it uses as much as digits as its factorization.

641391397967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 65.

The spelling of 641391397967 in words is "six hundred forty-one billion, three hundred ninety-one million, three hundred ninety-seven thousand, nine hundred sixty-seven".