18258486820 has 96 divisors (see below), whose sum is σ = 45017280000. Its totient is φ = 6217690752.

The previous prime is 18258486817. The next prime is 18258486823. The reversal of 18258486820 is 2868485281.

It is an interprime number because it is at equal distance from previous prime (18258486817) and next prime (18258486823).

It is a super-2 number, since 2×18258486820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18258486823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1013209 + ... + 1031071.

It is an arithmetic number, because the mean of its divisors is an integer number (468930000).

Almost surely, 2^18258486820 is an apocalyptic number.

18258486820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18258486820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22508640000).

18258486820 is an abundant number, since it is smaller than the sum of its proper divisors (26758793180).

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

18258486820 is a wasteful number, since it uses less digits than its factorization.

18258486820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18042 (or 18026 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 52.

The spelling of 18258486820 in words is "eighteen billion, two hundred fifty-eight million, four hundred eighty-six thousand, eight hundred twenty".