643255426145 has 32 divisors (see below), whose sum is σ = 793316557440. Its totient is φ = 500440227840.

The previous prime is 643255426127. The next prime is 643255426199. The reversal of 643255426145 is 541624552346.

It is not a de Polignac number, because 643255426145 - 2¹⁰ = 643255425121 is a prime.

It is a super-2 number, since 2×643255426145² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643255426145.

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 31 ways as a sum of consecutive naturals, for example, 52888865 + ... + 52901025.

It is an arithmetic number, because the mean of its divisors is an integer number (24791142420).

Almost surely, 2^643255426145 is an apocalyptic number.

It is an amenable number.

643255426145 is a deficient number, since it is larger than the sum of its proper divisors (150061131295).

643255426145 is a wasteful number, since it uses less digits than its factorization.

643255426145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265.

The product of its digits is 3456000, while the sum is 47.

The spelling of 643255426145 in words is "six hundred forty-three billion, two hundred fifty-five million, four hundred twenty-six thousand, one hundred forty-five".