18180377 has 2 divisors, whose sum is σ = 18180378. Its totient is φ = 18180376.

The previous prime is 18180347. The next prime is 18180389. The reversal of 18180377 is 77308181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 295936 = 4229^2 + 544^2 .

It is an emirp because it is prime and its reverse (77308181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18180377 - 2⁶ = 18180313 is a prime.

It is a super-2 number, since 2×18180377² = 661052215724258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18180347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090188 + 9090189.

It is an arithmetic number, because the mean of its divisors is an integer number (9090189).

Almost surely, 2^18180377 is an apocalyptic number.

It is an amenable number.

18180377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180377 is an equidigital number, since it uses as much as digits as its factorization.

18180377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 18180377 is about 4263.8453302154. The cubic root of 18180377 is about 262.9466415773.

The spelling of 18180377 in words is "eighteen million, one hundred eighty thousand, three hundred seventy-seven".