166240999 has 2 divisors, whose sum is σ = 166241000. Its totient is φ = 166240998.

The previous prime is 166240993. The next prime is 166241057. The reversal of 166240999 is 999042661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166240999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166240993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83120499 + 83120500.

It is an arithmetic number, because the mean of its divisors is an integer number (83120500).

Almost surely, 2^166240999 is an apocalyptic number.

166240999 is a deficient number, since it is larger than the sum of its proper divisors (1).

166240999 is an equidigital number, since it uses as much as digits as its factorization.

166240999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 166240999 is about 12893.4479096943. The cubic root of 166240999 is about 549.8523008357.

It can be divided in two parts, 166 and 240999, that added together give a triangular number (241165 = T₆₉₄).

The spelling of 166240999 in words is "one hundred sixty-six million, two hundred forty thousand, nine hundred ninety-nine".