66550165667 has 4 divisors (see below), whose sum is σ = 67487492016. Its totient is φ = 65612839320.

The previous prime is 66550165651. The next prime is 66550165679. The reversal of 66550165667 is 76656105566.

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

It is a cyclic number.

It is not a de Polignac number, because 66550165667 - 2⁴ = 66550165651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66550165267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468663068 + ... + 468663209.

It is an arithmetic number, because the mean of its divisors is an integer number (16871873004).

Almost surely, 2^66550165667 is an apocalyptic number.

66550165667 is a deficient number, since it is larger than the sum of its proper divisors (937326349).

66550165667 is an equidigital number, since it uses as much as digits as its factorization.

66550165667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937326348.

The product of its (nonzero) digits is 6804000, while the sum is 53.

The spelling of 66550165667 in words is "sixty-six billion, five hundred fifty million, one hundred sixty-five thousand, six hundred sixty-seven".