66839105 has 4 divisors (see below), whose sum is σ = 80206932. Its totient is φ = 53471280.

The previous prime is 66839099. The next prime is 66839107. The reversal of 66839105 is 50193866.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49056016 + 17783089 = 7004^2 + 4217^2 .

It is not a de Polignac number, because 66839105 - 2¹⁰ = 66838081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66839107) 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, 6683906 + ... + 6683915.

It is an arithmetic number, because the mean of its divisors is an integer number (20051733).

Almost surely, 2^66839105 is an apocalyptic number.

It is an amenable number.

66839105 is a deficient number, since it is larger than the sum of its proper divisors (13367827).

66839105 is a wasteful number, since it uses less digits than its factorization.

66839105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13367826.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 66839105 is about 8175.5186379825. The cubic root of 66839105 is about 405.8294336387.

The spelling of 66839105 in words is "sixty-six million, eight hundred thirty-nine thousand, one hundred five".