66706871919 has 16 divisors (see below), whose sum is σ = 89534364672. Its totient is φ = 44175595968.

The previous prime is 66706871849. The next prime is 66706871921. The reversal of 66706871919 is 91917860766.

It is not a de Polignac number, because 66706871919 - 2¹¹ = 66706869871 is a prime.

It is a super-2 number, since 2×66706871919² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706851919) 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, 940354 + ... + 1008800.

It is an arithmetic number, because the mean of its divisors is an integer number (5595897792).

Almost surely, 2^66706871919 is an apocalyptic number.

66706871919 is a deficient number, since it is larger than the sum of its proper divisors (22827492753).

66706871919 is a wasteful number, since it uses less digits than its factorization.

66706871919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70606.

The product of its (nonzero) digits is 6858432, while the sum is 60.

The spelling of 66706871919 in words is "sixty-six billion, seven hundred six million, eight hundred seventy-one thousand, nine hundred nineteen".