691220110101967 has 2 divisors, whose sum is σ = 691220110101968. Its totient is φ = 691220110101966.

The previous prime is 691220110101901. The next prime is 691220110102069. The reversal of 691220110101967 is 769101011022196.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691220110101967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691220110101767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345610055050983 + 345610055050984.

It is an arithmetic number, because the mean of its divisors is an integer number (345610055050984).

Almost surely, 2^{691220110101967} is an apocalyptic number.

691220110101967 is a deficient number, since it is larger than the sum of its proper divisors (1).

691220110101967 is an equidigital number, since it uses as much as digits as its factorization.

691220110101967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 691220110101967 in words is "six hundred ninety-one trillion, two hundred twenty billion, one hundred ten million, one hundred one thousand, nine hundred sixty-seven".