166949983 has 2 divisors, whose sum is σ = 166949984. Its totient is φ = 166949982.

The previous prime is 166949971. The next prime is 166950011. The reversal of 166949983 is 389949661.

It is a weak prime.

It is an emirp because it is prime and its reverse (389949661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166949983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166949933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83474991 + 83474992.

It is an arithmetic number, because the mean of its divisors is an integer number (83474992).

Almost surely, 2^166949983 is an apocalyptic number.

166949983 is a deficient number, since it is larger than the sum of its proper divisors (1).

166949983 is an equidigital number, since it uses as much as digits as its factorization.

166949983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The square root of 166949983 is about 12920.9126225666. The cubic root of 166949983 is about 550.6328615964.

The spelling of 166949983 in words is "one hundred sixty-six million, nine hundred forty-nine thousand, nine hundred eighty-three".