18885212640 has 384 divisors, whose sum is σ = 79519104000. Its totient is φ = 4089305088.

The previous prime is 18885212611. The next prime is 18885212653. The reversal of 18885212640 is 4621258881.

18885212640 is a `hidden beast` number, since 1 + 8 + 88 + 521 + 2 + 6 + 40 = 666.

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 (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 558126 + ... + 590994.

It is an arithmetic number, because the mean of its divisors is an integer number (207081000).

Almost surely, 2^18885212640 is an apocalyptic number.

18885212640 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 18885212640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39759552000).

18885212640 is an abundant number, since it is smaller than the sum of its proper divisors (60633891360).

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

18885212640 is a wasteful number, since it uses less digits than its factorization.

18885212640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32919 (or 32905 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 18885212640 in words is "eighteen billion, eight hundred eighty-five million, two hundred twelve thousand, six hundred forty".