83665071 has 12 divisors (see below), whose sum is σ = 138113872. Its totient is φ = 47808576.

The previous prime is 83665069. The next prime is 83665091. The reversal of 83665071 is 17056638.

It is not a de Polignac number, because 83665071 - 2¹ = 83665069 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83665031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663946 + ... + 664071.

Almost surely, 2^83665071 is an apocalyptic number.

83665071 is a deficient number, since it is larger than the sum of its proper divisors (54448801).

83665071 is a wasteful number, since it uses less digits than its factorization.

83665071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328030 (or 1328027 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 83665071 is about 9146.8612649367. The cubic root of 83665071 is about 437.3690640552.

The spelling of 83665071 in words is "eighty-three million, six hundred sixty-five thousand, seventy-one".