18240382477 has 2 divisors, whose sum is σ = 18240382478. Its totient is φ = 18240382476.

The previous prime is 18240382471. The next prime is 18240382487. The reversal of 18240382477 is 77428304281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17397873801 + 842508676 = 131901^2 + 29026^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240382477 - 2¹¹ = 18240380429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240382471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120191238 + 9120191239.

It is an arithmetic number, because the mean of its divisors is an integer number (9120191239).

Almost surely, 2^18240382477 is an apocalyptic number.

It is an amenable number.

18240382477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240382477 is an equidigital number, since it uses as much as digits as its factorization.

18240382477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 46.

The spelling of 18240382477 in words is "eighteen billion, two hundred forty million, three hundred eighty-two thousand, four hundred seventy-seven".