43061646181 has 2 divisors, whose sum is σ = 43061646182. Its totient is φ = 43061646180.

The previous prime is 43061646149. The next prime is 43061646203. The reversal of 43061646181 is 18164616034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29642508900 + 13419137281 = 172170^2 + 115841^2 .

It is a cyclic number.

It is not a de Polignac number, because 43061646181 - 2⁵ = 43061646149 is a prime.

It is a super-2 number, since 2×43061646181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43061646781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21530823090 + 21530823091.

It is an arithmetic number, because the mean of its divisors is an integer number (21530823091).

Almost surely, 2^43061646181 is an apocalyptic number.

It is an amenable number.

43061646181 is a deficient number, since it is larger than the sum of its proper divisors (1).

43061646181 is an equidigital number, since it uses as much as digits as its factorization.

43061646181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 43061646181 in words is "forty-three billion, sixty-one million, six hundred forty-six thousand, one hundred eighty-one".