43458606481681 has 2 divisors, whose sum is σ = 43458606481682. Its totient is φ = 43458606481680.

The previous prime is 43458606481643. The next prime is 43458606481699. The reversal of 43458606481681 is 18618460685434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35098325779456 + 8360280702225 = 5924384^2 + 2891415^2 .

It is a cyclic number.

It is not a de Polignac number, because 43458606481681 - 2⁴⁵ = 8274234392849 is a prime.

It is a super-2 number, since 2×43458606481681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43458646481681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21729303240840 + 21729303240841.

It is an arithmetic number, because the mean of its divisors is an integer number (21729303240841).

Almost surely, 2^{43458606481681} is an apocalyptic number.

It is an amenable number.

43458606481681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43458606481681 is an equidigital number, since it uses as much as digits as its factorization.

43458606481681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 106168320, while the sum is 64.

The spelling of 43458606481681 in words is "forty-three trillion, four hundred fifty-eight billion, six hundred six million, four hundred eighty-one thousand, six hundred eighty-one".