643112356 has 12 divisors (see below), whose sum is σ = 1130118220. Its totient is φ = 320221440.

The previous prime is 643112341. The next prime is 643112357. The reversal of 643112356 is 653211346.

It can be written as a sum of positive squares in 2 ways, for example, as 347822500 + 295289856 = 18650^2 + 17184^2 .

It is not an unprimeable number, because it can be changed into a prime (643112357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332601 + ... + 334528.

Almost surely, 2^643112356 is an apocalyptic number.

It is an amenable number.

643112356 is a deficient number, since it is larger than the sum of its proper divisors (487005864).

643112356 is a wasteful number, since it uses less digits than its factorization.

643112356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667374 (or 667372 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 643112356 is about 25359.6600134939. The cubic root of 643112356 is about 863.1685692375.

The spelling of 643112356 in words is "six hundred forty-three million, one hundred twelve thousand, three hundred fifty-six".