43254521856 has 672 divisors, whose sum is σ = 161067170880. Its totient is φ = 11370627072.

The previous prime is 43254521797. The next prime is 43254521887. The reversal of 43254521856 is 65812545234.

43254521856 is a `hidden beast` number, since 4 + 3 + 2 + 545 + 21 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140894055 + ... + 140894361.

It is an arithmetic number, because the mean of its divisors is an integer number (239683290).

Almost surely, 2^43254521856 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 43254521856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80533585440).

43254521856 is an abundant number, since it is smaller than the sum of its proper divisors (117812649024).

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

43254521856 is a wasteful number, since it uses less digits than its factorization.

43254521856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 332 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The spelling of 43254521856 in words is "forty-three billion, two hundred fifty-four million, five hundred twenty-one thousand, eight hundred fifty-six".