1226662643 has 2 divisors, whose sum is σ = 1226662644. Its totient is φ = 1226662642.

The previous prime is 1226662639. The next prime is 1226662649. The reversal of 1226662643 is 3462666221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1226662643 - 2² = 1226662639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1226662597 and 1226662606.

It is not a weakly prime, because it can be changed into another prime (1226662649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613331321 + 613331322.

It is an arithmetic number, because the mean of its divisors is an integer number (613331322).

Almost surely, 2^1226662643 is an apocalyptic number.

1226662643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226662643 is an equidigital number, since it uses as much as digits as its factorization.

1226662643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 38.

The square root of 1226662643 is about 35023.7439888999. The cubic root of 1226662643 is about 1070.4713453114.

The spelling of 1226662643 in words is "one billion, two hundred twenty-six million, six hundred sixty-two thousand, six hundred forty-three".