18905666340 has 192 divisors, whose sum is σ = 62447874048. Its totient is φ = 4221696000.

The previous prime is 18905666321. The next prime is 18905666347. The reversal of 18905666340 is 4366650981.

It is a self number, because there is not a number n which added to its sum of digits gives 18905666340.

It is not an unprimeable number, because it can be changed into a prime (18905666347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 509415 + ... + 545265.

It is an arithmetic number, because the mean of its divisors is an integer number (325249344).

Almost surely, 2^18905666340 is an apocalyptic number.

18905666340 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 18905666340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31223937024).

18905666340 is an abundant number, since it is smaller than the sum of its proper divisors (43542207708).

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

18905666340 is a wasteful number, since it uses less digits than its factorization.

18905666340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35938 (or 35936 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 18905666340 in words is "eighteen billion, nine hundred five million, six hundred sixty-six thousand, three hundred forty".