643253516606 has 4 divisors (see below), whose sum is σ = 964880274912. Its totient is φ = 321626758302.

The previous prime is 643253516593. The next prime is 643253516611. The reversal of 643253516606 is 606615352346.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160813379150 + ... + 160813379153.

It is an arithmetic number, because the mean of its divisors is an integer number (241220068728).

Almost surely, 2^643253516606 is an apocalyptic number.

643253516606 is a deficient number, since it is larger than the sum of its proper divisors (321626758306).

643253516606 is a wasteful number, since it uses less digits than its factorization.

643253516606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321626758305.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 643253516606 in words is "six hundred forty-three billion, two hundred fifty-three million, five hundred sixteen thousand, six hundred six".