166503637 has 2 divisors, whose sum is σ = 166503638. Its totient is φ = 166503636.

The previous prime is 166503613. The next prime is 166503653. The reversal of 166503637 is 736305661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99820081 + 66683556 = 9991^2 + 8166^2 .

It is a cyclic number.

It is not a de Polignac number, because 166503637 - 2¹⁵ = 166470869 is a prime.

It is a super-2 number, since 2×166503637² = 55446922268455538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166503596 and 166503605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166503607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83251818 + 83251819.

It is an arithmetic number, because the mean of its divisors is an integer number (83251819).

Almost surely, 2^166503637 is an apocalyptic number.

It is an amenable number.

166503637 is a deficient number, since it is larger than the sum of its proper divisors (1).

166503637 is an equidigital number, since it uses as much as digits as its factorization.

166503637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 166503637 is about 12903.6288306817. The cubic root of 166503637 is about 550.1417122438.

The spelling of 166503637 in words is "one hundred sixty-six million, five hundred three thousand, six hundred thirty-seven".