166137203 has 2 divisors, whose sum is σ = 166137204. Its totient is φ = 166137202.

The previous prime is 166137187. The next prime is 166137217. The reversal of 166137203 is 302731661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166137203 - 2⁴ = 166137187 is a prime.

It is not a weakly prime, because it can be changed into another prime (166137703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83068601 + 83068602.

It is an arithmetic number, because the mean of its divisors is an integer number (83068602).

Almost surely, 2^166137203 is an apocalyptic number.

166137203 is a deficient number, since it is larger than the sum of its proper divisors (1).

166137203 is an equidigital number, since it uses as much as digits as its factorization.

166137203 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 29.

The square root of 166137203 is about 12889.4221359997. The cubic root of 166137203 is about 549.7378397982.

Adding to 166137203 its reverse (302731661), we get a palindrome (468868864).

The spelling of 166137203 in words is "one hundred sixty-six million, one hundred thirty-seven thousand, two hundred three".