18290949465820 has 12 divisors (see below), whose sum is σ = 38410993878264. Its totient is φ = 7316379786320.

The previous prime is 18290949465779. The next prime is 18290949465947. The reversal of 18290949465820 is 2856494909281.

It is a super-2 number, since 2×18290949465820² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457273736626 + ... + 457273736665.

It is an arithmetic number, because the mean of its divisors is an integer number (3200916156522).

Almost surely, 2^{18290949465820} is an apocalyptic number.

18290949465820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18290949465820 is an abundant number, since it is smaller than the sum of its proper divisors (20120044412444).

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

18290949465820 is a wasteful number, since it uses less digits than its factorization.

18290949465820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914547473300 (or 914547473298 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 67.

The spelling of 18290949465820 in words is "eighteen trillion, two hundred ninety billion, nine hundred forty-nine million, four hundred sixty-five thousand, eight hundred twenty".