18557158556 has 12 divisors (see below), whose sum is σ = 32476057320. Its totient is φ = 9278285040.

The previous prime is 18557158531. The next prime is 18557158559. The reversal of 18557158556 is 65585175581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557158559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132446 + ... + 233786.

It is an arithmetic number, because the mean of its divisors is an integer number (2706338110).

Almost surely, 2^18557158556 is an apocalyptic number.

It is an amenable number.

18557158556 is a deficient number, since it is larger than the sum of its proper divisors (13918898764).

18557158556 is a wasteful number, since it uses less digits than its factorization.

18557158556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147124 (or 147122 counting only the distinct ones).

The product of its digits is 8400000, while the sum is 56.

The spelling of 18557158556 in words is "eighteen billion, five hundred fifty-seven million, one hundred fifty-eight thousand, five hundred fifty-six".