646015110123242 has 16 divisors (see below), whose sum is σ = 1002437841414600. Its totient is φ = 311869176353280.

The previous prime is 646015110123233. The next prime is 646015110123289. The reversal of 646015110123242 is 242321011510646.

It can be written as a sum of positive squares in 4 ways, for example, as 582815933179561 + 63199176943681 = 24141581^2 + 7949791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 646015110123196 and 646015110123205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181855442 + ... + 185373762.

Almost surely, 2^{646015110123242} is an apocalyptic number.

646015110123242 is a deficient number, since it is larger than the sum of its proper divisors (356422731291358).

646015110123242 is a wasteful number, since it uses less digits than its factorization.

646015110123242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684121.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 646015110123242 its reverse (242321011510646), we get a palindrome (888336121633888).

The spelling of 646015110123242 in words is "six hundred forty-six trillion, fifteen billion, one hundred ten million, one hundred twenty-three thousand, two hundred forty-two".