166640111 has 6 divisors (see below), whose sum is σ = 183166536. Its totient is φ = 151490900.

The previous prime is 166640101. The next prime is 166640143. The reversal of 166640111 is 111046661.

It is a de Polignac number, because none of the positive numbers 2^k-166640111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640101) 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, 688475 + ... + 688716.

It is an arithmetic number, because the mean of its divisors is an integer number (30527756).

Almost surely, 2^166640111 is an apocalyptic number.

166640111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166640111 is a deficient number, since it is larger than the sum of its proper divisors (16526425).

166640111 is a wasteful number, since it uses less digits than its factorization.

166640111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377213 (or 1377202 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 166640111 is about 12908.9159498387. The cubic root of 166640111 is about 550.2919783035.

Adding to 166640111 its reverse (111046661), we get a palindrome (277686772).

The spelling of 166640111 in words is "one hundred sixty-six million, six hundred forty thousand, one hundred eleven".