1667518334849 has 2 divisors, whose sum is σ = 1667518334850. Its totient is φ = 1667518334848.

The previous prime is 1667518334827. The next prime is 1667518334851. The reversal of 1667518334849 is 9484338157661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1643157368449 + 24360966400 = 1281857^2 + 156080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667518334849 - 2⁸ = 1667518334593 is a prime.

Together with 1667518334851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1667518334819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833759167424 + 833759167425.

It is an arithmetic number, because the mean of its divisors is an integer number (833759167425).

Almost surely, 2^{1667518334849} is an apocalyptic number.

It is an amenable number.

1667518334849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667518334849 is an equidigital number, since it uses as much as digits as its factorization.

1667518334849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104509440, while the sum is 65.

The spelling of 1667518334849 in words is "one trillion, six hundred sixty-seven billion, five hundred eighteen million, three hundred thirty-four thousand, eight hundred forty-nine".