166766667661 has 8 divisors (see below), whose sum is σ = 183236104800. Its totient is φ = 150515369040.

The previous prime is 166766667653. The next prime is 166766667679.

166766667661 is nontrivially palindromic in base 10.

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 166766667661 - 2³ = 166766667653 is a prime.

It is a super-2 number, since 2×166766667661² (a number of 23 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 = 166766667593 and 166766667602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166766667601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54533026 + ... + 54536083.

It is an arithmetic number, because the mean of its divisors is an integer number (22904513100).

Almost surely, 2^166766667661 is an apocalyptic number.

166766667661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166766667661 is a deficient number, since it is larger than the sum of its proper divisors (16469437139).

166766667661 is a wasteful number, since it uses less digits than its factorization.

166766667661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109069259.

The product of its digits is 82301184, while the sum is 64.

The spelling of 166766667661 in words is "one hundred sixty-six billion, seven hundred sixty-six million, six hundred sixty-seven thousand, six hundred sixty-one".