66687534138511 has 24 divisors (see below), whose sum is σ = 78794210614896. Its totient is φ = 55949104823040.

The previous prime is 66687534138497. The next prime is 66687534138541. The reversal of 66687534138511 is 11583143578666.

66687534138511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66687534138511 - 2¹⁵ = 66687534105743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66687534138541) 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 in 23 ways as a sum of consecutive naturals, for example, 4360411 + ... + 12344563.

It is an arithmetic number, because the mean of its divisors is an integer number (3283092108954).

Almost surely, 2^{66687534138511} is an apocalyptic number.

66687534138511 is a deficient number, since it is larger than the sum of its proper divisors (12106676476385).

66687534138511 is a wasteful number, since it uses less digits than its factorization.

66687534138511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7988683 (or 7988670 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 64.

The spelling of 66687534138511 in words is "sixty-six trillion, six hundred eighty-seven billion, five hundred thirty-four million, one hundred thirty-eight thousand, five hundred eleven".