643707473727 has 32 divisors (see below), whose sum is σ = 898316523520. Its totient is φ = 409507176960.

The previous prime is 643707473711. The next prime is 643707473771. The reversal of 643707473727 is 727374707346.

It is not a de Polignac number, because 643707473727 - 2⁴ = 643707473711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643707473797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36780843 + ... + 36798339.

It is an arithmetic number, because the mean of its divisors is an integer number (28072391360).

Almost surely, 2^643707473727 is an apocalyptic number.

643707473727 is a deficient number, since it is larger than the sum of its proper divisors (254609049793).

643707473727 is a wasteful number, since it uses less digits than its factorization.

643707473727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23023.

The product of its (nonzero) digits is 29042496, while the sum is 57.

The spelling of 643707473727 in words is "six hundred forty-three billion, seven hundred seven million, four hundred seventy-three thousand, seven hundred twenty-seven".