43761216181 has 2 divisors, whose sum is σ = 43761216182. Its totient is φ = 43761216180.

The previous prime is 43761216173. The next prime is 43761216277. The reversal of 43761216181 is 18161216734.

43761216181 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., 36706728100 + 7054488081 = 191590^2 + 83991^2 .

It is a cyclic number.

It is not a de Polignac number, because 43761216181 - 2³ = 43761216173 is a prime.

It is a super-2 number, since 2×43761216181² (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 (43761216581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21880608090 + 21880608091.

It is an arithmetic number, because the mean of its divisors is an integer number (21880608091).

Almost surely, 2^43761216181 is an apocalyptic number.

It is an amenable number.

43761216181 is a deficient number, since it is larger than the sum of its proper divisors (1).

43761216181 is an equidigital number, since it uses as much as digits as its factorization.

43761216181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The spelling of 43761216181 in words is "forty-three billion, seven hundred sixty-one million, two hundred sixteen thousand, one hundred eighty-one".