23855887421520 has 640 divisors, whose sum is σ = 94863408353280. Its totient is φ = 4815009792000.

The previous prime is 23855887421507. The next prime is 23855887421557. The reversal of 23855887421520 is 2512478855832.

It is a super-2 number, since 2×23855887421520² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

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 127 ways as a sum of consecutive naturals, for example, 173439975 + ... + 173577465.

It is an arithmetic number, because the mean of its divisors is an integer number (148224075552).

Almost surely, 2^{23855887421520} is an apocalyptic number.

23855887421520 is a gapful number since it is divisible by the number (20) 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 23855887421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47431704176640).

23855887421520 is an abundant number, since it is smaller than the sum of its proper divisors (71007520931760).

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

23855887421520 is a wasteful number, since it uses less digits than its factorization.

23855887421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137795 (or 137789 counting only the distinct ones).

The product of its (nonzero) digits is 43008000, while the sum is 60.

The spelling of 23855887421520 in words is "twenty-three trillion, eight hundred fifty-five billion, eight hundred eighty-seven million, four hundred twenty-one thousand, five hundred twenty".