1643563226 has 8 divisors (see below), whose sum is σ = 2550356820. Its totient is φ = 793444288.

The previous prime is 1643563223. The next prime is 1643563237. The reversal of 1643563226 is 6223653461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1618050625 + 25512601 = 40225^2 + 5051^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1643563226.

It is not an unprimeable number, because it can be changed into a prime (1643563223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14168591 + ... + 14168706.

Almost surely, 2^1643563226 is an apocalyptic number.

1643563226 is a deficient number, since it is larger than the sum of its proper divisors (906793594).

1643563226 is a wasteful number, since it uses less digits than its factorization.

1643563226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28337328.

The product of its digits is 155520, while the sum is 38.

The square root of 1643563226 is about 40540.8833894872. The cubic root of 1643563226 is about 1180.1271590439.

The spelling of 1643563226 in words is "one billion, six hundred forty-three million, five hundred sixty-three thousand, two hundred twenty-six".