18599106557 has 2 divisors, whose sum is σ = 18599106558. Its totient is φ = 18599106556.

The previous prime is 18599106551. The next prime is 18599106569. The reversal of 18599106557 is 75560199581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14692106521 + 3907000036 = 121211^2 + 62506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18599106557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18599106551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9299553278 + 9299553279.

It is an arithmetic number, because the mean of its divisors is an integer number (9299553279).

Almost surely, 2^18599106557 is an apocalyptic number.

It is an amenable number.

18599106557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18599106557 is an equidigital number, since it uses as much as digits as its factorization.

18599106557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402000, while the sum is 56.

The spelling of 18599106557 in words is "eighteen billion, five hundred ninety-nine million, one hundred six thousand, five hundred fifty-seven".