43161620085 has 24 divisors (see below), whose sum is σ = 78751027680. Its totient is φ = 21807976032.

The previous prime is 43161620069. The next prime is 43161620087. The reversal of 43161620085 is 58002616134.

It is a happy number.

43161620085 is a `hidden beast` number, since 4 + 31 + 616 + 2 + 0 + 0 + 8 + 5 = 666.

It is not a de Polignac number, because 43161620085 - 2⁴ = 43161620069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43161620087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25239859 + ... + 25241568.

It is an arithmetic number, because the mean of its divisors is an integer number (3281292820).

Almost surely, 2^43161620085 is an apocalyptic number.

43161620085 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43161620085 is a deficient number, since it is larger than the sum of its proper divisors (35589407595).

43161620085 is a wasteful number, since it uses less digits than its factorization.

43161620085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50481457 (or 50481454 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 43161620085 in words is "forty-three billion, one hundred sixty-one million, six hundred twenty thousand, eighty-five".