166186686611 has 6 divisors (see below), whose sum is σ = 182668011036. Its totient is φ = 151078805900.

The previous prime is 166186686563. The next prime is 166186686613. The reversal of 166186686611 is 116686681661.

It is not a de Polignac number, because 166186686611 - 2¹⁴ = 166186670227 is a prime.

It is a super-3 number, since 3×166186686611³ (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 (166186686613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 686721725 + ... + 686721966.

It is an arithmetic number, because the mean of its divisors is an integer number (30444668506).

Almost surely, 2^166186686611 is an apocalyptic number.

166186686611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166186686611 is a deficient number, since it is larger than the sum of its proper divisors (16481324425).

166186686611 is a wasteful number, since it uses less digits than its factorization.

166186686611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373443713 (or 1373443702 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 56.

The spelling of 166186686611 in words is "one hundred sixty-six billion, one hundred eighty-six million, six hundred eighty-six thousand, six hundred eleven".