66987031087 has 2 divisors, whose sum is σ = 66987031088. Its totient is φ = 66987031086.

The previous prime is 66987031079. The next prime is 66987031109. The reversal of 66987031087 is 78013078966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66987031087 - 2³ = 66987031079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66987031037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33493515543 + 33493515544.

It is an arithmetic number, because the mean of its divisors is an integer number (33493515544).

Almost surely, 2^66987031087 is an apocalyptic number.

66987031087 is a deficient number, since it is larger than the sum of its proper divisors (1).

66987031087 is an equidigital number, since it uses as much as digits as its factorization.

66987031087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 66987031087 in words is "sixty-six billion, nine hundred eighty-seven million, thirty-one thousand, eighty-seven".