43038337681 has 2 divisors, whose sum is σ = 43038337682. Its totient is φ = 43038337680.

The previous prime is 43038337649. The next prime is 43038337697. The reversal of 43038337681 is 18673383034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39966407056 + 3071930625 = 199916^2 + 55425^2 .

It is a cyclic number.

It is not a de Polignac number, because 43038337681 - 2⁵ = 43038337649 is a prime.

It is a super-2 number, since 2×43038337681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43038337981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21519168840 + 21519168841.

It is an arithmetic number, because the mean of its divisors is an integer number (21519168841).

Almost surely, 2^43038337681 is an apocalyptic number.

It is an amenable number.

43038337681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43038337681 is an equidigital number, since it uses as much as digits as its factorization.

43038337681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 43038337681 in words is "forty-three billion, thirty-eight million, three hundred thirty-seven thousand, six hundred eighty-one".