643701655022 has 8 divisors (see below), whose sum is σ = 965608023072. Its totient is φ = 321832314000.

The previous prime is 643701654991. The next prime is 643701655049. The reversal of 643701655022 is 220556107346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9213254 + ... + 9282857.

It is an arithmetic number, because the mean of its divisors is an integer number (120701002884).

Almost surely, 2^643701655022 is an apocalyptic number.

643701655022 is a deficient number, since it is larger than the sum of its proper divisors (321906368050).

643701655022 is a wasteful number, since it uses less digits than its factorization.

643701655022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18513514.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 643701655022 in words is "six hundred forty-three billion, seven hundred one million, six hundred fifty-five thousand, twenty-two".