643131544455162 has 24 divisors (see below), whose sum is σ = 1592516205317856. Its totient is φ = 183751869844296.

The previous prime is 643131544455161. The next prime is 643131544455209. The reversal of 643131544455162 is 261554445131346.

It is a happy number.

643131544455162 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 3 + 1 + 544 + 45 + 51 + 6 + 2 = 666.

643131544455162 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643131544455099 and 643131544455108.

It is not an unprimeable number, because it can be changed into a prime (643131544455161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2552109303268 + ... + 2552109303519.

It is an arithmetic number, because the mean of its divisors is an integer number (66354841888244).

Almost surely, 2^{643131544455162} is an apocalyptic number.

643131544455162 is an abundant number, since it is smaller than the sum of its proper divisors (949384660862694).

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

643131544455162 is a wasteful number, since it uses less digits than its factorization.

643131544455162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104218606802 (or 5104218606799 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 643131544455162 in words is "six hundred forty-three trillion, one hundred thirty-one billion, five hundred forty-four million, four hundred fifty-five thousand, one hundred sixty-two".