83765870809 has 4 divisors (see below), whose sum is σ = 87407865216. Its totient is φ = 80123876404.

The previous prime is 83765870789. The next prime is 83765870821. The reversal of 83765870809 is 90807856738.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83765870809 - 2²¹ = 83763773657 is a prime.

It is a super-2 number, since 2×83765870809² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83765871809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820997169 + ... + 1820997214.

It is an arithmetic number, because the mean of its divisors is an integer number (21851966304).

Almost surely, 2^83765870809 is an apocalyptic number.

It is an amenable number.

83765870809 is a deficient number, since it is larger than the sum of its proper divisors (3641994407).

83765870809 is a wasteful number, since it uses less digits than its factorization.

83765870809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641994406.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 83765870809 in words is "eighty-three billion, seven hundred sixty-five million, eight hundred seventy thousand, eight hundred nine".