166418503 has 2 divisors, whose sum is σ = 166418504. Its totient is φ = 166418502.

The previous prime is 166418449. The next prime is 166418537. The reversal of 166418503 is 305814661.

It is a happy number.

It is an a-pointer prime, because the next prime (166418537) can be obtained adding 166418503 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166418503 - 2¹³ = 166410311 is a prime.

It is a super-2 number, since 2×166418503² = 55390236281522018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166418543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83209251 + 83209252.

It is an arithmetic number, because the mean of its divisors is an integer number (83209252).

Almost surely, 2^166418503 is an apocalyptic number.

166418503 is a deficient number, since it is larger than the sum of its proper divisors (1).

166418503 is an equidigital number, since it uses as much as digits as its factorization.

166418503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 166418503 is about 12900.3295694335. The cubic root of 166418503 is about 550.0479330126.

The spelling of 166418503 in words is "one hundred sixty-six million, four hundred eighteen thousand, five hundred three".