83685679909 has 4 divisors (see below), whose sum is σ = 90123039916. Its totient is φ = 77248319904.

The previous prime is 83685679897. The next prime is 83685679919. The reversal of 83685679909 is 90997658638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90997658638 = 2 ⋅45498829319.

It can be written as a sum of positive squares in 2 ways, for example, as 25074722500 + 58610957409 = 158350^2 + 242097^2 .

It is a cyclic number.

It is not a de Polignac number, because 83685679909 - 2¹³ = 83685671717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83685679919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218679984 + ... + 3218680009.

It is an arithmetic number, because the mean of its divisors is an integer number (22530759979).

Almost surely, 2^83685679909 is an apocalyptic number.

It is an amenable number.

83685679909 is a deficient number, since it is larger than the sum of its proper divisors (6437360007).

83685679909 is a wasteful number, since it uses less digits than its factorization.

83685679909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6437360006.

The product of its (nonzero) digits is 176359680, while the sum is 70.

The spelling of 83685679909 in words is "eighty-three billion, six hundred eighty-five million, six hundred seventy-nine thousand, nine hundred nine".