1667613217 has 2 divisors, whose sum is σ = 1667613218. Its totient is φ = 1667613216.

The previous prime is 1667613209. The next prime is 1667613221. The reversal of 1667613217 is 7123167661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1333418256 + 334194961 = 36516^2 + 18281^2 .

It is an emirp because it is prime and its reverse (7123167661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1667613217 - 2³ = 1667613209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1667613217.

It is not a weakly prime, because it can be changed into another prime (1667613257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833806608 + 833806609.

It is an arithmetic number, because the mean of its divisors is an integer number (833806609).

Almost surely, 2^1667613217 is an apocalyptic number.

It is an amenable number.

1667613217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667613217 is an equidigital number, since it uses as much as digits as its factorization.

1667613217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 1667613217 is about 40836.4202275371. The cubic root of 1667613217 is about 1185.8555109220.

The spelling of 1667613217 in words is "one billion, six hundred sixty-seven million, six hundred thirteen thousand, two hundred seventeen".