66487678459 has 2 divisors, whose sum is σ = 66487678460. Its totient is φ = 66487678458.

The previous prime is 66487678393. The next prime is 66487678529. The reversal of 66487678459 is 95487678466.

It is an a-pointer prime, because the next prime (66487678529) can be obtained adding 66487678459 to its sum of digits (70).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66487678459 - 2¹⁷ = 66487547387 is a prime.

It is a super-2 number, since 2×66487678459² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66487648459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33243839229 + 33243839230.

It is an arithmetic number, because the mean of its divisors is an integer number (33243839230).

Almost surely, 2^66487678459 is an apocalyptic number.

66487678459 is a deficient number, since it is larger than the sum of its proper divisors (1).

66487678459 is an equidigital number, since it uses as much as digits as its factorization.

66487678459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 487710720, while the sum is 70.

The spelling of 66487678459 in words is "sixty-six billion, four hundred eighty-seven million, six hundred seventy-eight thousand, four hundred fifty-nine".