18352688640 has 640 divisors, whose sum is σ = 73057324032. Its totient is φ = 3861381120.

The previous prime is 18352688617. The next prime is 18352688693. The reversal of 18352688640 is 4688625381.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 18669589 + ... + 18670571.

Almost surely, 2^18352688640 is an apocalyptic number.

18352688640 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 18352688640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36528662016).

18352688640 is an abundant number, since it is smaller than the sum of its proper divisors (54704635392).

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

18352688640 is a wasteful number, since it uses less digits than its factorization.

18352688640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 18352688640 in words is "eighteen billion, three hundred fifty-two million, six hundred eighty-eight thousand, six hundred forty".