643040036402 has 8 divisors (see below), whose sum is σ = 969948658800. Its totient is φ = 319723816804.

The previous prime is 643040036399. The next prime is 643040036423. The reversal of 643040036402 is 204630040346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898100252 + ... + 898100967.

It is an arithmetic number, because the mean of its divisors is an integer number (121243582350).

Almost surely, 2^643040036402 is an apocalyptic number.

643040036402 is a deficient number, since it is larger than the sum of its proper divisors (326908622398).

643040036402 is a wasteful number, since it uses less digits than its factorization.

643040036402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796201400.

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 643040036402 its reverse (204630040346), we get a palindrome (847670076748).

The spelling of 643040036402 in words is "six hundred forty-three billion, forty million, thirty-six thousand, four hundred two".