166618723 has 2 divisors, whose sum is σ = 166618724. Its totient is φ = 166618722.

The previous prime is 166618709. The next prime is 166618747. The reversal of 166618723 is 327816661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166618723 - 2²¹ = 164521571 is a prime.

It is not a weakly prime, because it can be changed into another prime (166618523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83309361 + 83309362.

It is an arithmetic number, because the mean of its divisors is an integer number (83309362).

Almost surely, 2^166618723 is an apocalyptic number.

166618723 is a deficient number, since it is larger than the sum of its proper divisors (1).

166618723 is an equidigital number, since it uses as much as digits as its factorization.

166618723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 166618723 is about 12908.0875035770. The cubic root of 166618723 is about 550.2684342553.

The spelling of 166618723 in words is "one hundred sixty-six million, six hundred eighteen thousand, seven hundred twenty-three".