83989766071 has 4 divisors (see below), whose sum is σ = 85366647544. Its totient is φ = 82612884600.

The previous prime is 83989766059. The next prime is 83989766111. The reversal of 83989766071 is 17066798938.

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

It is a cyclic number.

It is not a de Polignac number, because 83989766071 - 2¹⁷ = 83989634999 is a prime.

It is a super-2 number, since 2×83989766071² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83989765994 and 83989766012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83989866071) 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, 688440645 + ... + 688440766.

It is an arithmetic number, because the mean of its divisors is an integer number (21341661886).

Almost surely, 2^83989766071 is an apocalyptic number.

83989766071 is a deficient number, since it is larger than the sum of its proper divisors (1376881473).

83989766071 is a wasteful number, since it uses less digits than its factorization.

83989766071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376881472.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 83989766071 in words is "eighty-three billion, nine hundred eighty-nine million, seven hundred sixty-six thousand, seventy-one".