43173857661 has 12 divisors (see below), whose sum is σ = 63274083936. Its totient is φ = 26165974120.

The previous prime is 43173857659. The next prime is 43173857767. The reversal of 43173857661 is 16675837134.

It is not a de Polignac number, because 43173857661 - 2¹ = 43173857659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43173857861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59467761 + ... + 59468486.

It is an arithmetic number, because the mean of its divisors is an integer number (5272840328).

Almost surely, 2^43173857661 is an apocalyptic number.

It is an amenable number.

43173857661 is a deficient number, since it is larger than the sum of its proper divisors (20100226275).

43173857661 is a wasteful number, since it uses less digits than its factorization.

43173857661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118936272 (or 118936261 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The spelling of 43173857661 in words is "forty-three billion, one hundred seventy-three million, eight hundred fifty-seven thousand, six hundred sixty-one".