643131203442 has 64 divisors (see below), whose sum is σ = 1583395451904. Its totient is φ = 169584528960.

The previous prime is 643131203431. The next prime is 643131203557. The reversal of 643131203442 is 244302131346.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2809317 + ... + 3029607.

It is an arithmetic number, because the mean of its divisors is an integer number (24740553936).

Almost surely, 2^643131203442 is an apocalyptic number.

643131203442 is an abundant number, since it is smaller than the sum of its proper divisors (940264248462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643131203442 is a wasteful number, since it uses less digits than its factorization.

643131203442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225663.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 643131203442 its reverse (244302131346), we get a palindrome (887433334788).

The spelling of 643131203442 in words is "six hundred forty-three billion, one hundred thirty-one million, two hundred three thousand, four hundred forty-two".