83666347 has 4 divisors (see below), whose sum is σ = 85612120. Its totient is φ = 81720576.

The previous prime is 83666327. The next prime is 83666351. The reversal of 83666347 is 74366638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74366638 = 2 ⋅37183319.

It is a cyclic number.

It is not a de Polignac number, because 83666347 - 2¹¹ = 83664299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1945729 = 83666347 / (8 + 3 + 6 + 6 + 6 + 3 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83666327) 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, 972822 + ... + 972907.

It is an arithmetic number, because the mean of its divisors is an integer number (21403030).

Almost surely, 2^83666347 is an apocalyptic number.

83666347 is a deficient number, since it is larger than the sum of its proper divisors (1945773).

83666347 is a wasteful number, since it uses less digits than its factorization.

83666347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945772.

The product of its digits is 435456, while the sum is 43.

The square root of 83666347 is about 9146.9310153734. The cubic root of 83666347 is about 437.3712875243.

The spelling of 83666347 in words is "eighty-three million, six hundred sixty-six thousand, three hundred forty-seven".