18565941540 has 48 divisors (see below), whose sum is σ = 53661565440. Its totient is φ = 4791210240.

The previous prime is 18565941497. The next prime is 18565941557. The reversal of 18565941540 is 4514956581.

It is a self number, because there is not a number n which added to its sum of digits gives 18565941540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4988985 + ... + 4992704.

It is an arithmetic number, because the mean of its divisors is an integer number (1117949280).

Almost surely, 2^18565941540 is an apocalyptic number.

18565941540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18565941540 is an abundant number, since it is smaller than the sum of its proper divisors (35095623900).

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

18565941540 is a wasteful number, since it uses less digits than its factorization.

18565941540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981732 (or 9981730 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 48.

The spelling of 18565941540 in words is "eighteen billion, five hundred sixty-five million, nine hundred forty-one thousand, five hundred forty".