166203073 has 2 divisors, whose sum is σ = 166203074. Its totient is φ = 166203072.

The previous prime is 166203049. The next prime is 166203077. The reversal of 166203073 is 370302661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91068849 + 75134224 = 9543^2 + 8668^2 .

It is an emirp because it is prime and its reverse (370302661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166203073 - 2¹⁷ = 166072001 is a prime.

It is a super-2 number, since 2×166203073² = 55246922949286658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166203077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83101536 + 83101537.

It is an arithmetic number, because the mean of its divisors is an integer number (83101537).

Almost surely, 2^166203073 is an apocalyptic number.

It is an amenable number.

166203073 is a deficient number, since it is larger than the sum of its proper divisors (1).

166203073 is an equidigital number, since it uses as much as digits as its factorization.

166203073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 166203073 is about 12891.9770787882. The cubic root of 166203073 is about 549.8104834651.

The spelling of 166203073 in words is "one hundred sixty-six million, two hundred three thousand, seventy-three".