643477774346 has 32 divisors (see below), whose sum is σ = 1074324384000. Its totient is φ = 286571721280.

The previous prime is 643477774343. The next prime is 643477774421.

643477774346 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (643477774343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454580 + ... + 1222128.

It is an arithmetic number, because the mean of its divisors is an integer number (33572637000).

Almost surely, 2^643477774346 is an apocalyptic number.

643477774346 is a deficient number, since it is larger than the sum of its proper divisors (430846609654).

643477774346 is a wasteful number, since it uses less digits than its factorization.

643477774346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768334.

The product of its digits is 199148544, while the sum is 62.

The spelling of 643477774346 in words is "six hundred forty-three billion, four hundred seventy-seven million, seven hundred seventy-four thousand, three hundred forty-six".