18520616589696 has 1536 divisors, whose sum is σ = 65478821990400. Its totient is φ = 4965886328832.

The previous prime is 18520616589689. The next prime is 18520616589697. The reversal of 18520616589696 is 69698561602581.

It is a happy number.

18520616589696 is a `hidden beast` number, since 1 + 8 + 5 + 20 + 6 + 16 + 589 + 6 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520616589697) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25758854425 + ... + 25758855143.

It is an arithmetic number, because the mean of its divisors is an integer number (42629441400).

Almost surely, 2^{18520616589696} is an apocalyptic number.

18520616589696 is a gapful number since it is divisible by the number (16) 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 18520616589696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32739410995200).

18520616589696 is an abundant number, since it is smaller than the sum of its proper divisors (46958205400704).

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

18520616589696 is a wasteful number, since it uses less digits than its factorization.

18520616589696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 913 counting only the distinct ones).

The product of its (nonzero) digits is 335923200, while the sum is 72.

The spelling of 18520616589696 in words is "eighteen trillion, five hundred twenty billion, six hundred sixteen million, five hundred eighty-nine thousand, six hundred ninety-six".