66206123 has 4 divisors (see below), whose sum is σ = 66348360. Its totient is φ = 66063888.

The previous prime is 66206093. The next prime is 66206131. The reversal of 66206123 is 32160266.

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 66206123 - 2¹⁶ = 66140587 is a prime.

It is a super-3 number, since 3×66206123³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66206092 and 66206101.

It is not an unprimeable number, because it can be changed into a prime (66206323) 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, 70418 + ... + 71351.

It is an arithmetic number, because the mean of its divisors is an integer number (16587090).

Almost surely, 2^66206123 is an apocalyptic number.

66206123 is a deficient number, since it is larger than the sum of its proper divisors (142237).

66206123 is a wasteful number, since it uses less digits than its factorization.

66206123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142236.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66206123 is about 8136.7145089403. The cubic root of 66206123 is about 404.5442681491.

Adding to 66206123 its reverse (32160266), we get a palindrome (98366389).

The spelling of 66206123 in words is "sixty-six million, two hundred six thousand, one hundred twenty-three".