66708875831 has 8 divisors (see below), whose sum is σ = 71964842544. Its totient is φ = 61470696960.

The previous prime is 66708875813. The next prime is 66708875839. The reversal of 66708875831 is 13857880766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66708875831 - 2¹⁴ = 66708859447 is a prime.

It is a super-2 number, since 2×66708875831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708875839) 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 7 ways as a sum of consecutive naturals, for example, 4439165 + ... + 4454166.

It is an arithmetic number, because the mean of its divisors is an integer number (8995605318).

Almost surely, 2^66708875831 is an apocalyptic number.

66708875831 is a deficient number, since it is larger than the sum of its proper divisors (5255966713).

66708875831 is a wasteful number, since it uses less digits than its factorization.

66708875831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893921.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 66708875831 in words is "sixty-six billion, seven hundred eight million, eight hundred seventy-five thousand, eight hundred thirty-one".