18557943860 has 24 divisors (see below), whose sum is σ = 39022925256. Its totient is φ = 7413416960.

The previous prime is 18557943851. The next prime is 18557943863. The reversal of 18557943860 is 6834975581.

It can be written as a sum of positive squares in 4 ways, for example, as 1623606436 + 16934337424 = 40294^2 + 130132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18557943796 and 18557943805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557943863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594437 + ... + 624876.

It is an arithmetic number, because the mean of its divisors is an integer number (1625955219).

Almost surely, 2^18557943860 is an apocalyptic number.

18557943860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18557943860 is an abundant number, since it is smaller than the sum of its proper divisors (20464981396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18557943860 is a wasteful number, since it uses less digits than its factorization.

18557943860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220083 (or 1220081 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 18557943860 in words is "eighteen billion, five hundred fifty-seven million, nine hundred forty-three thousand, eight hundred sixty".