18471950640 has 640 divisors, whose sum is σ = 75795148800. Its totient is φ = 4075868160.

The previous prime is 18471950597. The next prime is 18471950641. The reversal of 18471950640 is 4605917481.

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

It is not an unprimeable number, because it can be changed into a prime (18471950641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 24401142 + ... + 24401898.

It is an arithmetic number, because the mean of its divisors is an integer number (118429920).

Almost surely, 2^18471950640 is an apocalyptic number.

18471950640 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 18471950640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37897574400).

18471950640 is an abundant number, since it is smaller than the sum of its proper divisors (57323198160).

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

18471950640 is a wasteful number, since it uses less digits than its factorization.

18471950640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 18471950640 in words is "eighteen billion, four hundred seventy-one million, nine hundred fifty thousand, six hundred forty".