18865455040 has 56 divisors (see below), whose sum is σ = 45019917072. Its totient is φ = 7529963520.

The previous prime is 18865455013. The next prime is 18865455047. The reversal of 18865455040 is 4055456881.

It is a super-2 number, since 2×18865455040² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18865455047) 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, 86320 + ... + 212560.

Almost surely, 2^18865455040 is an apocalyptic number.

18865455040 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 18865455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22509958536).

18865455040 is an abundant number, since it is smaller than the sum of its proper divisors (26154462032).

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

18865455040 is a wasteful number, since it uses less digits than its factorization.

18865455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126725 (or 126715 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 46.

The spelling of 18865455040 in words is "eighteen billion, eight hundred sixty-five million, four hundred fifty-five thousand, forty".