643435440314 has 4 divisors (see below), whose sum is σ = 965153160474. Its totient is φ = 321717720156.

The previous prime is 643435440253. The next prime is 643435440317. The reversal of 643435440314 is 413044534346.

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

It can be written as a sum of positive squares in only one way, i.e., 548406897025 + 95028543289 = 740545^2 + 308267^2 .

It is not an unprimeable number, because it can be changed into a prime (643435440317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160858860077 + ... + 160858860080.

Almost surely, 2^643435440314 is an apocalyptic number.

643435440314 is a deficient number, since it is larger than the sum of its proper divisors (321717720160).

643435440314 is a wasteful number, since it uses less digits than its factorization.

643435440314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321717720159.

The product of its (nonzero) digits is 829440, while the sum is 41.

The spelling of 643435440314 in words is "six hundred forty-three billion, four hundred thirty-five million, four hundred forty thousand, three hundred fourteen".