822157643 has 4 divisors (see below), whose sum is σ = 822461640. Its totient is φ = 821853648.

The previous prime is 822157631. The next prime is 822157673. The reversal of 822157643 is 346751228.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 822157643 - 2¹⁴ = 822141259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 822157597 and 822157606.

It is not an unprimeable number, because it can be changed into a prime (822157613) 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, 147905 + ... + 153362.

It is an arithmetic number, because the mean of its divisors is an integer number (205615410).

Almost surely, 2^822157643 is an apocalyptic number.

822157643 is a deficient number, since it is larger than the sum of its proper divisors (303997).

822157643 is a wasteful number, since it uses less digits than its factorization.

822157643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303996.

The product of its digits is 80640, while the sum is 38.

The square root of 822157643 is about 28673.2914573824. The cubic root of 822157643 is about 936.8103915391.

The spelling of 822157643 in words is "eight hundred twenty-two million, one hundred fifty-seven thousand, six hundred forty-three".