43391646161 has 2 divisors, whose sum is σ = 43391646162. Its totient is φ = 43391646160.

The previous prime is 43391646157. The next prime is 43391646167. The reversal of 43391646161 is 16164619334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27830580625 + 15561065536 = 166825^2 + 124744^2 .

It is a cyclic number.

It is not a de Polignac number, because 43391646161 - 2² = 43391646157 is a prime.

It is a super-2 number, since 2×43391646161² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43391646167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21695823080 + 21695823081.

It is an arithmetic number, because the mean of its divisors is an integer number (21695823081).

Almost surely, 2^43391646161 is an apocalyptic number.

It is an amenable number.

43391646161 is a deficient number, since it is larger than the sum of its proper divisors (1).

43391646161 is an equidigital number, since it uses as much as digits as its factorization.

43391646161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The spelling of 43391646161 in words is "forty-three billion, three hundred ninety-one million, six hundred forty-six thousand, one hundred sixty-one".