66666688888487 has 2 divisors, whose sum is σ = 66666688888488. Its totient is φ = 66666688888486.

The previous prime is 66666688888439. The next prime is 66666688888517. The reversal of 66666688888487 is 78488888666666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66666688888487 - 2⁸ = 66666688888231 is a prime.

It is a super-2 number, since 2×66666688888487² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66666688888487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666688881487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333344444243 + 33333344444244.

It is an arithmetic number, because the mean of its divisors is an integer number (33333344444244).

Almost surely, 2^{66666688888487} is an apocalyptic number.

66666688888487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666688888487 is an equidigital number, since it uses as much as digits as its factorization.

66666688888487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 342456532992, while the sum is 95.

The spelling of 66666688888487 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, four hundred eighty-seven".