18704066640 has 320 divisors, whose sum is σ = 70443110400. Its totient is φ = 4010176512.

The previous prime is 18704066629. The next prime is 18704066651. The reversal of 18704066640 is 4666040781.

It is an interprime number because it is at equal distance from previous prime (18704066629) and next prime (18704066651).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 18704066592 and 18704066601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3284916 + ... + 3290604.

It is an arithmetic number, because the mean of its divisors is an integer number (220134720).

Almost surely, 2^18704066640 is an apocalyptic number.

18704066640 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 18704066640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35221555200).

18704066640 is an abundant number, since it is smaller than the sum of its proper divisors (51739043760).

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

18704066640 is a wasteful number, since it uses less digits than its factorization.

18704066640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834 (or 5828 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 18704066640 in words is "eighteen billion, seven hundred four million, sixty-six thousand, six hundred forty".