18503552357 has 2 divisors, whose sum is σ = 18503552358. Its totient is φ = 18503552356.

The previous prime is 18503552339. The next prime is 18503552393. The reversal of 18503552357 is 75325530581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16167376801 + 2336175556 = 127151^2 + 48334^2 .

It is a cyclic number.

It is not a de Polignac number, because 18503552357 - 2⁸ = 18503552101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18503552057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9251776178 + 9251776179.

It is an arithmetic number, because the mean of its divisors is an integer number (9251776179).

Almost surely, 2^18503552357 is an apocalyptic number.

It is an amenable number.

18503552357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18503552357 is an equidigital number, since it uses as much as digits as its factorization.

18503552357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 18503552357 in words is "eighteen billion, five hundred three million, five hundred fifty-two thousand, three hundred fifty-seven".