643505362334 has 4 divisors (see below), whose sum is σ = 965258043504. Its totient is φ = 321752681166.

The previous prime is 643505362333. The next prime is 643505362363. The reversal of 643505362334 is 433263505346.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×643505362334² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643505362333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160876340582 + ... + 160876340585.

It is an arithmetic number, because the mean of its divisors is an integer number (241314510876).

Almost surely, 2^643505362334 is an apocalyptic number.

643505362334 is a deficient number, since it is larger than the sum of its proper divisors (321752681170).

643505362334 is a wasteful number, since it uses less digits than its factorization.

643505362334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321752681169.

The product of its (nonzero) digits is 2332800, while the sum is 44.

The spelling of 643505362334 in words is "six hundred forty-three billion, five hundred five million, three hundred sixty-two thousand, three hundred thirty-four".