66971719495 has 16 divisors (see below), whose sum is σ = 81479260512. Its totient is φ = 52835466240.

The previous prime is 66971719483. The next prime is 66971719511. The reversal of 66971719495 is 59491717966.

It is a de Polignac number, because none of the positive numbers 2^k-66971719495 is a prime.

It is a super-2 number, since 2×66971719495² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4004100 + ... + 4020790.

It is an arithmetic number, because the mean of its divisors is an integer number (5092453782).

Almost surely, 2^66971719495 is an apocalyptic number.

66971719495 is a deficient number, since it is larger than the sum of its proper divisors (14507541017).

66971719495 is a wasteful number, since it uses less digits than its factorization.

66971719495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27762.

The product of its digits is 25719120, while the sum is 64.

The spelling of 66971719495 in words is "sixty-six billion, nine hundred seventy-one million, seven hundred nineteen thousand, four hundred ninety-five".