18152993557 has 2 divisors, whose sum is σ = 18152993558. Its totient is φ = 18152993556.

The previous prime is 18152993513. The next prime is 18152993569. The reversal of 18152993557 is 75539925181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15505479441 + 2647514116 = 124521^2 + 51454^2 .

It is a cyclic number.

It is not a de Polignac number, because 18152993557 - 2¹¹ = 18152991509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18152993498 and 18152993507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18152993587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9076496778 + 9076496779.

It is an arithmetic number, because the mean of its divisors is an integer number (9076496779).

Almost surely, 2^18152993557 is an apocalyptic number.

It is an amenable number.

18152993557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18152993557 is an equidigital number, since it uses as much as digits as its factorization.

18152993557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402000, while the sum is 55.

The spelling of 18152993557 in words is "eighteen billion, one hundred fifty-two million, nine hundred ninety-three thousand, five hundred fifty-seven".