18485393501 has 2 divisors, whose sum is σ = 18485393502. Its totient is φ = 18485393500.

The previous prime is 18485393483. The next prime is 18485393519. The reversal of 18485393501 is 10539358481.

It is a balanced prime because it is at equal distance from previous prime (18485393483) and next prime (18485393519).

It can be written as a sum of positive squares in only one way, i.e., 16173226276 + 2312167225 = 127174^2 + 48085^2 .

It is an emirp because it is prime and its reverse (10539358481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18485393501 - 2¹⁰ = 18485392477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18485393551) 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, 9242696750 + 9242696751.

It is an arithmetic number, because the mean of its divisors is an integer number (9242696751).

Almost surely, 2^18485393501 is an apocalyptic number.

It is an amenable number.

18485393501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18485393501 is an equidigital number, since it uses as much as digits as its factorization.

18485393501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 18485393501 in words is "eighteen billion, four hundred eighty-five million, three hundred ninety-three thousand, five hundred one".