43815416699981 has 2 divisors, whose sum is σ = 43815416699982. Its totient is φ = 43815416699980.

The previous prime is 43815416699953. The next prime is 43815416700043. The reversal of 43815416699981 is 18999661451834.

43815416699981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32810499522025 + 11004917177956 = 5728045^2 + 3317366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43815416699981 is a prime.

It is a super-2 number, since 2×43815416699981² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43815416699899 and 43815416699908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43815416699911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21907708349990 + 21907708349991.

It is an arithmetic number, because the mean of its divisors is an integer number (21907708349991).

Almost surely, 2^{43815416699981} is an apocalyptic number.

It is an amenable number.

43815416699981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43815416699981 is an equidigital number, since it uses as much as digits as its factorization.

43815416699981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403107840, while the sum is 74.

The spelling of 43815416699981 in words is "forty-three trillion, eight hundred fifteen billion, four hundred sixteen million, six hundred ninety-nine thousand, nine hundred eighty-one".