43653681864 has 160 divisors (see below), whose sum is σ = 137401830720. Its totient is φ = 12847849344.

The previous prime is 43653681847. The next prime is 43653681899. The reversal of 43653681864 is 46818635634.

43653681864 is a `hidden beast` number, since 4 + 36 + 536 + 8 + 18 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 43653681864.

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 39 ways as a sum of consecutive naturals, for example, 81099 + ... + 306405.

It is an arithmetic number, because the mean of its divisors is an integer number (858761442).

Almost surely, 2^43653681864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43653681864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68700915360).

43653681864 is an abundant number, since it is smaller than the sum of its proper divisors (93748148856).

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

43653681864 is a wasteful number, since it uses less digits than its factorization.

43653681864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225361 (or 225348 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

It can be divided in two parts, 436536 and 81864, that added together give a square (518400 = 720²).

The spelling of 43653681864 in words is "forty-three billion, six hundred fifty-three million, six hundred eighty-one thousand, eight hundred sixty-four".