166671623 has 2 divisors, whose sum is σ = 166671624. Its totient is φ = 166671622.

The previous prime is 166671611. The next prime is 166671641. The reversal of 166671623 is 326176661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166671623 - 2⁴ = 166671607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166671023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83335811 + 83335812.

It is an arithmetic number, because the mean of its divisors is an integer number (83335812).

Almost surely, 2^166671623 is an apocalyptic number.

166671623 is a deficient number, since it is larger than the sum of its proper divisors (1).

166671623 is an equidigital number, since it uses as much as digits as its factorization.

166671623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 166671623 is about 12910.1364438955. The cubic root of 166671623 is about 550.3266632457.

The spelling of 166671623 in words is "one hundred sixty-six million, six hundred seventy-one thousand, six hundred twenty-three".