4243737669961 has 2 divisors, whose sum is σ = 4243737669962. Its totient is φ = 4243737669960.

The previous prime is 4243737669959. The next prime is 4243737670001. The reversal of 4243737669961 is 1699667373424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2576137351225 + 1667600318736 = 1605035^2 + 1291356^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243737669961 - 2¹ = 4243737669959 is a prime.

It is a super-2 number, since 2×4243737669961² (a number of 26 digits) contains 22 as substring.

Together with 4243737669959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4243737669901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121868834980 + 2121868834981.

It is an arithmetic number, because the mean of its divisors is an integer number (2121868834981).

Almost surely, 2^{4243737669961} is an apocalyptic number.

It is an amenable number.

4243737669961 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243737669961 is an equidigital number, since it uses as much as digits as its factorization.

4243737669961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246903552, while the sum is 67.

The spelling of 4243737669961 in words is "four trillion, two hundred forty-three billion, seven hundred thirty-seven million, six hundred sixty-nine thousand, nine hundred sixty-one".