66934554667 has 16 divisors (see below), whose sum is σ = 71415032832. Its totient is φ = 62588152000.

The previous prime is 66934554637. The next prime is 66934554677. The reversal of 66934554667 is 76645543966.

It is a happy number.

It is not a de Polignac number, because 66934554667 - 2¹⁹ = 66934030379 is a prime.

It is a super-2 number, since 2×66934554667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66934554637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890292 + ... + 962542.

It is an arithmetic number, because the mean of its divisors is an integer number (4463439552).

Almost surely, 2^66934554667 is an apocalyptic number.

66934554667 is a deficient number, since it is larger than the sum of its proper divisors (4480478165).

66934554667 is a wasteful number, since it uses less digits than its factorization.

66934554667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73178.

The product of its digits is 97977600, while the sum is 61.

The spelling of 66934554667 in words is "sixty-six billion, nine hundred thirty-four million, five hundred fifty-four thousand, six hundred sixty-seven".