643019215977471 has 4 divisors (see below), whose sum is σ = 857358954636632. Its totient is φ = 428679477318312.

The previous prime is 643019215977449. The next prime is 643019215977521. The reversal of 643019215977471 is 174779512910346.

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

It is not a de Polignac number, because 643019215977471 - 2²¹ = 643019213880319 is a prime.

It is a super-3 number, since 3×643019215977471³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643019215977401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107169869329576 + ... + 107169869329581.

It is an arithmetic number, because the mean of its divisors is an integer number (214339738659158).

Almost surely, 2^{643019215977471} is an apocalyptic number.

643019215977471 is a deficient number, since it is larger than the sum of its proper divisors (214339738659161).

643019215977471 is a wasteful number, since it uses less digits than its factorization.

643019215977471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214339738659160.

The product of its (nonzero) digits is 80015040, while the sum is 66.

The spelling of 643019215977471 in words is "six hundred forty-three trillion, nineteen billion, two hundred fifteen million, nine hundred seventy-seven thousand, four hundred seventy-one".