643016642852 has 6 divisors (see below), whose sum is σ = 1125279124998. Its totient is φ = 321508321424.

The previous prime is 643016642833. The next prime is 643016642861. The reversal of 643016642852 is 258246610346.

It can be written as a sum of positive squares in only one way, i.e., 623063950336 + 19952692516 = 789344^2 + 141254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643016642797 and 643016642806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80377080353 + ... + 80377080360.

It is an arithmetic number, because the mean of its divisors is an integer number (187546520833).

Almost surely, 2^643016642852 is an apocalyptic number.

It is an amenable number.

643016642852 is a deficient number, since it is larger than the sum of its proper divisors (482262482146).

643016642852 is a wasteful number, since it uses less digits than its factorization.

643016642852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160754160717 (or 160754160715 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 643016642852 in words is "six hundred forty-three billion, sixteen million, six hundred forty-two thousand, eight hundred fifty-two".