83765870789 has 2 divisors, whose sum is σ = 83765870790. Its totient is φ = 83765870788.

The previous prime is 83765870701. The next prime is 83765870821. The reversal of 83765870789 is 98707856738.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81648490564 + 2117380225 = 285742^2 + 46015^2 .

It is a cyclic number.

It is not a de Polignac number, because 83765870789 - 2¹² = 83765866693 is a prime.

It is a super-2 number, since 2×83765870789² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83765870189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41882935394 + 41882935395.

It is an arithmetic number, because the mean of its divisors is an integer number (41882935395).

Almost surely, 2^83765870789 is an apocalyptic number.

It is an amenable number.

83765870789 is a deficient number, since it is larger than the sum of its proper divisors (1).

83765870789 is an equidigital number, since it uses as much as digits as its factorization.

83765870789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142248960, while the sum is 68.

The spelling of 83765870789 in words is "eighty-three billion, seven hundred sixty-five million, eight hundred seventy thousand, seven hundred eighty-nine".