18166537 has 2 divisors, whose sum is σ = 18166538. Its totient is φ = 18166536.

The previous prime is 18166507. The next prime is 18166541. The reversal of 18166537 is 73566181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 2134521 = 4004^2 + 1461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18166537 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18166496 and 18166505.

It is not a weakly prime, because it can be changed into another prime (18166507) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083268 + 9083269.

It is an arithmetic number, because the mean of its divisors is an integer number (9083269).

Almost surely, 2^18166537 is an apocalyptic number.

It is an amenable number.

18166537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166537 is an equidigital number, since it uses as much as digits as its factorization.

18166537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 18166537 is about 4262.2220730506. Note that the first 3 decimals coincide. The cubic root of 18166537 is about 262.8799010220.

The spelling of 18166537 in words is "eighteen million, one hundred sixty-six thousand, five hundred thirty-seven".