646105123 has 8 divisors (see below), whose sum is σ = 669992400. Its totient is φ = 622325088.

The previous prime is 646105091. The next prime is 646105129. The reversal of 646105123 is 321501646.

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

It is a cyclic number.

It is not a de Polignac number, because 646105123 - 2⁵ = 646105091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646105091 and 646105100.

It is not an unprimeable number, because it can be changed into a prime (646105129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14436 + ... + 38737.

It is an arithmetic number, because the mean of its divisors is an integer number (83749050).

Almost surely, 2^646105123 is an apocalyptic number.

646105123 is a deficient number, since it is larger than the sum of its proper divisors (23887277).

646105123 is a wasteful number, since it uses less digits than its factorization.

646105123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53621.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 646105123 is about 25418.5979747114. The cubic root of 646105123 is about 864.5054354859.

Adding to 646105123 its reverse (321501646), we get a palindrome (967606769).

The spelling of 646105123 in words is "six hundred forty-six million, one hundred five thousand, one hundred twenty-three".