166555722611 has 8 divisors (see below), whose sum is σ = 174105987840. Its totient is φ = 159031183432.

The previous prime is 166555722551. The next prime is 166555722643. The reversal of 166555722611 is 116227555661.

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 166555722611 - 2³⁰ = 165481980787 is a prime.

It is a super-3 number, since 3×166555722611³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166555722911) 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 7 ways as a sum of consecutive naturals, for example, 6418271 + ... + 6444168.

It is an arithmetic number, because the mean of its divisors is an integer number (21763248480).

Almost surely, 2^166555722611 is an apocalyptic number.

166555722611 is a deficient number, since it is larger than the sum of its proper divisors (7550265229).

166555722611 is a wasteful number, since it uses less digits than its factorization.

166555722611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12863025.

The product of its digits is 756000, while the sum is 47.

The spelling of 166555722611 in words is "one hundred sixty-six billion, five hundred fifty-five million, seven hundred twenty-two thousand, six hundred eleven".