18685154520 has 192 divisors, whose sum is σ = 65008419840. Its totient is φ = 4821897600.

The previous prime is 18685154507. The next prime is 18685154531. The reversal of 18685154520 is 2545158681.

18685154520 is a `hidden beast` number, since 1 + 8 + 6 + 85 + 1 + 545 + 20 = 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 47 ways as a sum of consecutive naturals, for example, 270315 + ... + 332325.

It is an arithmetic number, because the mean of its divisors is an integer number (338585520).

Almost surely, 2^18685154520 is an apocalyptic number.

18685154520 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 18685154520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32504209920).

18685154520 is an abundant number, since it is smaller than the sum of its proper divisors (46323265320).

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

18685154520 is a wasteful number, since it uses less digits than its factorization.

18685154520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62068 (or 62052 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 18685154520 in words is "eighteen billion, six hundred eighty-five million, one hundred fifty-four thousand, five hundred twenty".