66566771067 has 4 divisors (see below), whose sum is σ = 88755694760. Its totient is φ = 44377847376.

The previous prime is 66566771059. The next prime is 66566771087. The reversal of 66566771067 is 76017766566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66566771067 - 2³ = 66566771059 is a prime.

It is a super-2 number, since 2×66566771067² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66566770998 and 66566771016.

It is not an unprimeable number, because it can be changed into a prime (66566771087) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11094461842 + ... + 11094461847.

It is an arithmetic number, because the mean of its divisors is an integer number (22188923690).

Almost surely, 2^66566771067 is an apocalyptic number.

66566771067 is a deficient number, since it is larger than the sum of its proper divisors (22188923693).

66566771067 is a wasteful number, since it uses less digits than its factorization.

66566771067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22188923692.

The product of its (nonzero) digits is 13335840, while the sum is 57.

The spelling of 66566771067 in words is "sixty-six billion, five hundred sixty-six million, seven hundred seventy-one thousand, sixty-seven".