83638730705 has 4 divisors (see below), whose sum is σ = 100366476852. Its totient is φ = 66910984560.

The previous prime is 83638730689. The next prime is 83638730801. The reversal of 83638730705 is 50703783638.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62838456976 + 20800273729 = 250676^2 + 144223^2 .

It is not a de Polignac number, because 83638730705 - 2⁴ = 83638730689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8363873066 + ... + 8363873075.

It is an arithmetic number, because the mean of its divisors is an integer number (25091619213).

Almost surely, 2^83638730705 is an apocalyptic number.

It is an amenable number.

83638730705 is a deficient number, since it is larger than the sum of its proper divisors (16727746147).

83638730705 is a wasteful number, since it uses less digits than its factorization.

83638730705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16727746146.

The product of its (nonzero) digits is 2540160, while the sum is 50.

The spelling of 83638730705 in words is "eighty-three billion, six hundred thirty-eight million, seven hundred thirty thousand, seven hundred five".