66620277643 has 8 divisors (see below), whose sum is σ = 66958016400. Its totient is φ = 66282746880.

The previous prime is 66620277631. The next prime is 66620277649. The reversal of 66620277643 is 34677202666.

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 66620277643 - 2⁹ = 66620277131 is a prime.

It is a super-2 number, since 2×66620277643² (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 (66620277649) 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, 611583 + ... + 712231.

It is an arithmetic number, because the mean of its divisors is an integer number (8369752050).

Almost surely, 2^66620277643 is an apocalyptic number.

66620277643 is a deficient number, since it is larger than the sum of its proper divisors (337738757).

66620277643 is a wasteful number, since it uses less digits than its factorization.

66620277643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103997.

The product of its (nonzero) digits is 3048192, while the sum is 49.

The spelling of 66620277643 in words is "sixty-six billion, six hundred twenty million, two hundred seventy-seven thousand, six hundred forty-three".