66562987 has 2 divisors, whose sum is σ = 66562988. Its totient is φ = 66562986.

The previous prime is 66562981. The next prime is 66563009. The reversal of 66562987 is 78926566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66562987 - 2¹¹ = 66560939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66562987.

It is not a weakly prime, because it can be changed into another prime (66562981) 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, 33281493 + 33281494.

It is an arithmetic number, because the mean of its divisors is an integer number (33281494).

Almost surely, 2^66562987 is an apocalyptic number.

66562987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66562987 is an equidigital number, since it uses as much as digits as its factorization.

66562987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 66562987 is about 8158.6142818496. The cubic root of 66562987 is about 405.2698237514.

The spelling of 66562987 in words is "sixty-six million, five hundred sixty-two thousand, nine hundred eighty-seven".