43847116681 has 2 divisors, whose sum is σ = 43847116682. Its totient is φ = 43847116680.

The previous prime is 43847116679. The next prime is 43847116721. The reversal of 43847116681 is 18661174834.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22949523081 + 20897593600 = 151491^2 + 144560^2 .

It is a cyclic number.

It is not a de Polignac number, because 43847116681 - 2¹ = 43847116679 is a prime.

It is a super-2 number, since 2×43847116681² (a number of 22 digits) contains 22 as substring.

Together with 43847116679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43847114681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21923558340 + 21923558341.

It is an arithmetic number, because the mean of its divisors is an integer number (21923558341).

Almost surely, 2^43847116681 is an apocalyptic number.

It is an amenable number.

43847116681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43847116681 is an equidigital number, since it uses as much as digits as its factorization.

43847116681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 49.

The spelling of 43847116681 in words is "forty-three billion, eight hundred forty-seven million, one hundred sixteen thousand, six hundred eighty-one".