43581421013885 has 4 divisors (see below), whose sum is σ = 52297705216668. Its totient is φ = 34865136811104.

The previous prime is 43581421013827. The next prime is 43581421013917. The reversal of 43581421013885 is 58831012418534.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31399010524324 + 12182410489561 = 5603482^2 + 3490331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43581421013885 is a prime.

It is a super-2 number, since 2×43581421013885² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4358142101384 + ... + 4358142101393.

It is an arithmetic number, because the mean of its divisors is an integer number (13074426304167).

Almost surely, 2^{43581421013885} is an apocalyptic number.

It is an amenable number.

43581421013885 is a deficient number, since it is larger than the sum of its proper divisors (8716284202783).

43581421013885 is an equidigital number, since it uses as much as digits as its factorization.

43581421013885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8716284202782.

The product of its (nonzero) digits is 3686400, while the sum is 53.

The spelling of 43581421013885 in words is "forty-three trillion, five hundred eighty-one billion, four hundred twenty-one million, thirteen thousand, eight hundred eighty-five".