18273036165820 has 24 divisors (see below), whose sum is σ = 38398772024928. Its totient is φ = 7304377118400.

The previous prime is 18273036165799. The next prime is 18273036165823. The reversal of 18273036165820 is 2856163037281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18273036165823) 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, 302303271 + ... + 302363710.

It is an arithmetic number, because the mean of its divisors is an integer number (1599948834372).

Almost surely, 2^{18273036165820} is an apocalyptic number.

18273036165820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18273036165820 is an abundant number, since it is smaller than the sum of its proper divisors (20125735859108).

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

18273036165820 is a wasteful number, since it uses less digits than its factorization.

18273036165820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604668501 (or 604668499 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 18273036165820 in words is "eighteen trillion, two hundred seventy-three billion, thirty-six million, one hundred sixty-five thousand, eight hundred twenty".