18943154640 has 160 divisors (see below), whose sum is σ = 66766381440. Its totient is φ = 4934006784.

The previous prime is 18943154609. The next prime is 18943154647. The reversal of 18943154640 is 4645134981.

18943154640 is a `hidden beast` number, since 18 + 94 + 3 + 1 + 546 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943154647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9097 + ... + 194856.

It is an arithmetic number, because the mean of its divisors is an integer number (417289884).

Almost surely, 2^18943154640 is an apocalyptic number.

18943154640 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 18943154640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33383190720).

18943154640 is an abundant number, since it is smaller than the sum of its proper divisors (47823226800).

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

18943154640 is a wasteful number, since it uses less digits than its factorization.

18943154640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204018 (or 204006 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 18943154640 in words is "eighteen billion, nine hundred forty-three million, one hundred fifty-four thousand, six hundred forty".