243650052540 has 120 divisors (see below), whose sum is σ = 767620854000. Its totient is φ = 64694391552.

The previous prime is 243650052539. The next prime is 243650052623. The reversal of 243650052540 is 45250056342.

243650052540 is a `hidden beast` number, since 2 + 4 + 3 + 65 + 0 + 0 + 52 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 243650052495 and 243650052504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54711 + ... + 700209.

It is an arithmetic number, because the mean of its divisors is an integer number (6396840450).

Almost surely, 2^243650052540 is an apocalyptic number.

243650052540 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 243650052540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383810427000).

243650052540 is an abundant number, since it is smaller than the sum of its proper divisors (523970801460).

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

243650052540 is a wasteful number, since it uses less digits than its factorization.

243650052540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645753 (or 645742 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 243650052540 in words is "two hundred forty-three billion, six hundred fifty million, fifty-two thousand, five hundred forty".