43340688475681 has 2 divisors, whose sum is σ = 43340688475682. Its totient is φ = 43340688475680.

The previous prime is 43340688475523. The next prime is 43340688475687. The reversal of 43340688475681 is 18657488604334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38034553190656 + 5306135285025 = 6167216^2 + 2303505^2 .

It is a cyclic number.

It is not a de Polignac number, because 43340688475681 - 2³⁹ = 42790932661793 is a prime.

It is a super-2 number, since 2×43340688475681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43340688475687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21670344237840 + 21670344237841.

It is an arithmetic number, because the mean of its divisors is an integer number (21670344237841).

Almost surely, 2^{43340688475681} is an apocalyptic number.

It is an amenable number.

43340688475681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43340688475681 is an equidigital number, since it uses as much as digits as its factorization.

43340688475681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 371589120, while the sum is 67.

The spelling of 43340688475681 in words is "forty-three trillion, three hundred forty billion, six hundred eighty-eight million, four hundred seventy-five thousand, six hundred eighty-one".