643272255660 has 48 divisors (see below), whose sum is σ = 1801424249856. Its totient is φ = 171514322112.

The previous prime is 643272255653. The next prime is 643272255707. The reversal of 643272255660 is 66552272346.

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 15 ways as a sum of consecutive naturals, for example, 361692 + ... + 1190531.

It is an arithmetic number, because the mean of its divisors is an integer number (37529671872).

Almost surely, 2^643272255660 is an apocalyptic number.

643272255660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643272255660 is an abundant number, since it is smaller than the sum of its proper divisors (1158151994196).

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

643272255660 is a wasteful number, since it uses less digits than its factorization.

643272255660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559142 (or 1559140 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

The spelling of 643272255660 in words is "six hundred forty-three billion, two hundred seventy-two million, two hundred fifty-five thousand, six hundred sixty".