43061353646561 has 2 divisors, whose sum is σ = 43061353646562. Its totient is φ = 43061353646560.

The previous prime is 43061353646539. The next prime is 43061353646617. The reversal of 43061353646561 is 16564635316034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42029859505936 + 1031494140625 = 6483044^2 + 1015625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43061353646561 is a prime.

It is not a weakly prime, because it can be changed into another prime (43061353646161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21530676823280 + 21530676823281.

It is an arithmetic number, because the mean of its divisors is an integer number (21530676823281).

Almost surely, 2^{43061353646561} is an apocalyptic number.

It is an amenable number.

43061353646561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43061353646561 is an equidigital number, since it uses as much as digits as its factorization.

43061353646561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13996800, while the sum is 53.

The spelling of 43061353646561 in words is "forty-three trillion, sixty-one billion, three hundred fifty-three million, six hundred forty-six thousand, five hundred sixty-one".