18383075640 has 384 divisors, whose sum is σ = 64696320000. Its totient is φ = 4516162560.

The previous prime is 18383075603. The next prime is 18383075653. The reversal of 18383075640 is 4657038381.

18383075640 is a `hidden beast` number, since 1 + 8 + 3 + 83 + 0 + 7 + 564 + 0 = 666.

It is a super-2 number, since 2×18383075640² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25567201 + ... + 25567919.

It is an arithmetic number, because the mean of its divisors is an integer number (168480000).

Almost surely, 2^18383075640 is an apocalyptic number.

18383075640 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 18383075640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32348160000).

18383075640 is an abundant number, since it is smaller than the sum of its proper divisors (46313244360).

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

18383075640 is a wasteful number, since it uses less digits than its factorization.

18383075640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 18383075640 in words is "eighteen billion, three hundred eighty-three million, seventy-five thousand, six hundred forty".