166818983 has 2 divisors, whose sum is σ = 166818984. Its totient is φ = 166818982.

The previous prime is 166818959. The next prime is 166818989. The reversal of 166818983 is 389818661.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (389818661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166818983 - 2⁶ = 166818919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166818989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83409491 + 83409492.

It is an arithmetic number, because the mean of its divisors is an integer number (83409492).

Almost surely, 2^166818983 is an apocalyptic number.

166818983 is a deficient number, since it is larger than the sum of its proper divisors (1).

166818983 is an equidigital number, since it uses as much as digits as its factorization.

166818983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 166818983 is about 12915.8423263835. The cubic root of 166818983 is about 550.4888029218.

The spelling of 166818983 in words is "one hundred sixty-six million, eight hundred eighteen thousand, nine hundred eighty-three".