167666901665 has 4 divisors (see below), whose sum is σ = 201200282004. Its totient is φ = 134133521328.

The previous prime is 167666901643. The next prime is 167666901709. The reversal of 167666901665 is 566109666761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28335662224 + 139331239441 = 168332^2 + 373271^2 .

It is a cyclic number.

It is not a de Polignac number, because 167666901665 - 2²⁴ = 167650124449 is a prime.

It is a super-2 number, since 2×167666901665² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16766690162 + ... + 16766690171.

It is an arithmetic number, because the mean of its divisors is an integer number (50300070501).

Almost surely, 2^167666901665 is an apocalyptic number.

It is an amenable number.

167666901665 is a deficient number, since it is larger than the sum of its proper divisors (33533380339).

167666901665 is an equidigital number, since it uses as much as digits as its factorization.

167666901665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33533380338.

The product of its (nonzero) digits is 14696640, while the sum is 59.

The spelling of 167666901665 in words is "one hundred sixty-seven billion, six hundred sixty-six million, nine hundred one thousand, six hundred sixty-five".