643424166002 has 4 divisors (see below), whose sum is σ = 965136249006. Its totient is φ = 321712083000.

The previous prime is 643424165893. The next prime is 643424166013. The reversal of 643424166002 is 200661424346.

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., 640977973321 + 2446192681 = 800611^2 + 49459^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160856041499 + ... + 160856041502.

Almost surely, 2^643424166002 is an apocalyptic number.

643424166002 is a deficient number, since it is larger than the sum of its proper divisors (321712083004).

643424166002 is a wasteful number, since it uses less digits than its factorization.

643424166002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321712083003.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 643424166002 in words is "six hundred forty-three billion, four hundred twenty-four million, one hundred sixty-six thousand, two".