1666672087 has 2 divisors, whose sum is σ = 1666672088. Its totient is φ = 1666672086.

The previous prime is 1666672057. The next prime is 1666672093. The reversal of 1666672087 is 7802766661.

It is a strong prime.

It is an emirp because it is prime and its reverse (7802766661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1666672087 - 2¹¹ = 1666670039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666672087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666672057) 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, 833336043 + 833336044.

It is an arithmetic number, because the mean of its divisors is an integer number (833336044).

Almost surely, 2^1666672087 is an apocalyptic number.

1666672087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666672087 is an equidigital number, since it uses as much as digits as its factorization.

1666672087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 1666672087 is about 40824.8954315868. The cubic root of 1666672087 is about 1185.6323867985.

The spelling of 1666672087 in words is "one billion, six hundred sixty-six million, six hundred seventy-two thousand, eighty-seven".