43558989997 has 2 divisors, whose sum is σ = 43558989998. Its totient is φ = 43558989996.

The previous prime is 43558989941. The next prime is 43558990049. The reversal of 43558989997 is 79998985534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36486348196 + 7072641801 = 191014^2 + 84099^2 .

It is a cyclic number.

It is not a de Polignac number, because 43558989997 - 2⁷ = 43558989869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43558989907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21779494998 + 21779494999.

It is an arithmetic number, because the mean of its divisors is an integer number (21779494999).

Almost surely, 2^43558989997 is an apocalyptic number.

It is an amenable number.

43558989997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43558989997 is an equidigital number, since it uses as much as digits as its factorization.

43558989997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 881798400, while the sum is 76.

The spelling of 43558989997 in words is "forty-three billion, five hundred fifty-eight million, nine hundred eighty-nine thousand, nine hundred ninety-seven".