18548365440 has 512 divisors, whose sum is σ = 71912448000. Its totient is φ = 4007854080.

The previous prime is 18548365411. The next prime is 18548365469. The reversal of 18548365440 is 4456384581.

It is an interprime number because it is at equal distance from previous prime (18548365411) and next prime (18548365469).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18548365440.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 6820401 + ... + 6823119.

It is an arithmetic number, because the mean of its divisors is an integer number (140454000).

Almost surely, 2^18548365440 is an apocalyptic number.

18548365440 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 18548365440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35956224000).

18548365440 is an abundant number, since it is smaller than the sum of its proper divisors (53364082560).

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

18548365440 is a wasteful number, since it uses less digits than its factorization.

18548365440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788 (or 2776 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 48.

The spelling of 18548365440 in words is "eighteen billion, five hundred forty-eight million, three hundred sixty-five thousand, four hundred forty".