43166643343421 has 24 divisors (see below), whose sum is σ = 47211139578240. Its totient is φ = 39447203717376.

The previous prime is 43166643343393. The next prime is 43166643343429. The reversal of 43166643343421 is 12434334666134.

It is a de Polignac number, because none of the positive numbers 2^k-43166643343421 is a prime.

It is a super-2 number, since 2×43166643343421² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43166643343421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43166643343429) 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 23 ways as a sum of consecutive naturals, for example, 26123996 + ... + 27727178.

It is an arithmetic number, because the mean of its divisors is an integer number (1967130815760).

Almost surely, 2^{43166643343421} is an apocalyptic number.

It is an amenable number.

43166643343421 is a deficient number, since it is larger than the sum of its proper divisors (4044496234819).

43166643343421 is a wasteful number, since it uses less digits than its factorization.

43166643343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604805 (or 1604792 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 50.

The spelling of 43166643343421 in words is "forty-three trillion, one hundred sixty-six billion, six hundred forty-three million, three hundred forty-three thousand, four hundred twenty-one".