83665618 has 8 divisors (see below), whose sum is σ = 126268848. Its totient is φ = 41576004.

The previous prime is 83665613. The next prime is 83665633. The reversal of 83665618 is 81656638.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (83665613) 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, 127996 + ... + 128647.

It is an arithmetic number, because the mean of its divisors is an integer number (15783606).

Almost surely, 2^83665618 is an apocalyptic number.

83665618 is a deficient number, since it is larger than the sum of its proper divisors (42603230).

83665618 is a wasteful number, since it uses less digits than its factorization.

83665618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256808.

The product of its digits is 207360, while the sum is 43.

The square root of 83665618 is about 9146.8911658552. The cubic root of 83665618 is about 437.3700172222.

The spelling of 83665618 in words is "eighty-three million, six hundred sixty-five thousand, six hundred eighteen".