1667016649 has 2 divisors, whose sum is σ = 1667016650. Its totient is φ = 1667016648.

The previous prime is 1667016643. The next prime is 1667016667. The reversal of 1667016649 is 9466107661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1401978249 + 265038400 = 37443^2 + 16280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667016649 - 2³ = 1667016641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1667016599 and 1667016608.

It is not a weakly prime, because it can be changed into another prime (1667016641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833508324 + 833508325.

It is an arithmetic number, because the mean of its divisors is an integer number (833508325).

Almost surely, 2^1667016649 is an apocalyptic number.

It is an amenable number.

1667016649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667016649 is an equidigital number, since it uses as much as digits as its factorization.

1667016649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 1667016649 is about 40829.1152120640. The cubic root of 1667016649 is about 1185.7140856762.

The spelling of 1667016649 in words is "one billion, six hundred sixty-seven million, sixteen thousand, six hundred forty-nine".