18685769808440 has 64 divisors (see below), whose sum is σ = 50138214658560. Its totient is φ = 6128004009600.

The previous prime is 18685769808437. The next prime is 18685769808443. The reversal of 18685769808440 is 4480896758681.

It is an interprime number because it is at equal distance from previous prime (18685769808437) and next prime (18685769808443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685769808443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1450752086 + ... + 1450764965.

It is an arithmetic number, because the mean of its divisors is an integer number (783409604040).

Almost surely, 2^{18685769808440} is an apocalyptic number.

18685769808440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18685769808440 is an abundant number, since it is smaller than the sum of its proper divisors (31452444850120).

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

18685769808440 is a wasteful number, since it uses less digits than its factorization.

18685769808440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901517092 (or 2901517088 counting only the distinct ones).

The product of its (nonzero) digits is 743178240, while the sum is 74.

The spelling of 18685769808440 in words is "eighteen trillion, six hundred eighty-five billion, seven hundred sixty-nine million, eight hundred eight thousand, four hundred forty".