646613123 has 8 divisors (see below), whose sum is σ = 696715488. Its totient is φ = 596562624.

The previous prime is 646613101. The next prime is 646613129. The reversal of 646613123 is 321316646.

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 646613123 - 2¹⁴ = 646596739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646613123.

It is not an unprimeable number, because it can be changed into a prime (646613129) 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, 15215 + ... + 39047.

It is an arithmetic number, because the mean of its divisors is an integer number (87089436).

Almost surely, 2^646613123 is an apocalyptic number.

646613123 is a deficient number, since it is larger than the sum of its proper divisors (50102365).

646613123 is a wasteful number, since it uses less digits than its factorization.

646613123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25933.

The product of its digits is 15552, while the sum is 32.

The square root of 646613123 is about 25428.5886946169. The cubic root of 646613123 is about 864.7319485290.

Adding to 646613123 its reverse (321316646), we get a palindrome (967929769).

The spelling of 646613123 in words is "six hundred forty-six million, six hundred thirteen thousand, one hundred twenty-three".