18026947557 has 12 divisors (see below), whose sum is σ = 26189440524. Its totient is φ = 11948496000.

The previous prime is 18026947513. The next prime is 18026947559. The reversal of 18026947557 is 75574962081.

18026947557 is a `hidden beast` number, since 1 + 80 + 2 + 6 + 9 + 4 + 7 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16670424996 + 1356522561 = 129114^2 + 36831^2 .

It is not a de Polignac number, because 18026947557 - 2¹⁴ = 18026931173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18026947559) 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 in 11 ways as a sum of consecutive naturals, for example, 5787444 + ... + 5790557.

It is an arithmetic number, because the mean of its divisors is an integer number (2182453377).

Almost surely, 2^18026947557 is an apocalyptic number.

It is an amenable number.

18026947557 is a deficient number, since it is larger than the sum of its proper divisors (8162492967).

18026947557 is a wasteful number, since it uses less digits than its factorization.

18026947557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11578180 (or 11578177 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 18026947557 in words is "eighteen billion, twenty-six million, nine hundred forty-seven thousand, five hundred fifty-seven".