643851334246 has 32 divisors (see below), whose sum is σ = 987807363840. Its totient is φ = 314631622656.

The previous prime is 643851334241. The next prime is 643851334267. The reversal of 643851334246 is 642433158346.

643851334246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×643851334246² (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 643851334246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643851334241) 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, 29285610 + ... + 29307586.

It is an arithmetic number, because the mean of its divisors is an integer number (30868980120).

Almost surely, 2^643851334246 is an apocalyptic number.

643851334246 is a deficient number, since it is larger than the sum of its proper divisors (343956029594).

643851334246 is a wasteful number, since it uses less digits than its factorization.

643851334246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23088.

The product of its digits is 4976640, while the sum is 49.

The spelling of 643851334246 in words is "six hundred forty-three billion, eight hundred fifty-one million, three hundred thirty-four thousand, two hundred forty-six".