43643142157 has 2 divisors, whose sum is σ = 43643142158. Its totient is φ = 43643142156.

The previous prime is 43643142143. The next prime is 43643142187. The reversal of 43643142157 is 75124134634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36590333796 + 7052808361 = 191286^2 + 83981^2 .

It is a cyclic number.

It is not a de Polignac number, because 43643142157 - 2⁷ = 43643142029 is a prime.

It is a super-2 number, since 2×43643142157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43643142187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21821571078 + 21821571079.

It is an arithmetic number, because the mean of its divisors is an integer number (21821571079).

Almost surely, 2^43643142157 is an apocalyptic number.

It is an amenable number.

43643142157 is a deficient number, since it is larger than the sum of its proper divisors (1).

43643142157 is an equidigital number, since it uses as much as digits as its factorization.

43643142157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 40.

The spelling of 43643142157 in words is "forty-three billion, six hundred forty-three million, one hundred forty-two thousand, one hundred fifty-seven".