16669642987 has 2 divisors, whose sum is σ = 16669642988. Its totient is φ = 16669642986.

The previous prime is 16669642949. The next prime is 16669643083. The reversal of 16669642987 is 78924696661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78924696661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16669642987 - 2¹⁹ = 16669118699 is a prime.

It is not a weakly prime, because it can be changed into another prime (16669642387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334821493 + 8334821494.

It is an arithmetic number, because the mean of its divisors is an integer number (8334821494).

Almost surely, 2^16669642987 is an apocalyptic number.

16669642987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16669642987 is an equidigital number, since it uses as much as digits as its factorization.

16669642987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 64.

The spelling of 16669642987 in words is "sixteen billion, six hundred sixty-nine million, six hundred forty-two thousand, nine hundred eighty-seven".