643705356214 has 16 divisors (see below), whose sum is σ = 981584942400. Its totient is φ = 316542081024.

The previous prime is 643705356193. The next prime is 643705356251. The reversal of 643705356214 is 412653507346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7885629 + ... + 7966840.

It is an arithmetic number, because the mean of its divisors is an integer number (61349058900).

Almost surely, 2^643705356214 is an apocalyptic number.

643705356214 is a deficient number, since it is larger than the sum of its proper divisors (337879586186).

643705356214 is a wasteful number, since it uses less digits than its factorization.

643705356214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852807.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 643705356214 in words is "six hundred forty-three billion, seven hundred five million, three hundred fifty-six thousand, two hundred fourteen".