643675440202 has 4 divisors (see below), whose sum is σ = 965513160306. Its totient is φ = 321837720100.

The previous prime is 643675440173. The next prime is 643675440211. The reversal of 643675440202 is 202044576346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 643154276961 + 521163241 = 801969^2 + 22829^2 .

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, 160918860049 + ... + 160918860052.

Almost surely, 2^643675440202 is an apocalyptic number.

643675440202 is a deficient number, since it is larger than the sum of its proper divisors (321837720104).

643675440202 is a wasteful number, since it uses less digits than its factorization.

643675440202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321837720103.

The product of its (nonzero) digits is 967680, while the sum is 43.

The spelling of 643675440202 in words is "six hundred forty-three billion, six hundred seventy-five million, four hundred forty thousand, two hundred two".