8355679621 has 2 divisors, whose sum is σ = 8355679622. Its totient is φ = 8355679620.

The previous prime is 8355679613. The next prime is 8355679667. The reversal of 8355679621 is 1269765538.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7053480225 + 1302199396 = 83985^2 + 36086^2 .

It is a cyclic number.

It is not a de Polignac number, because 8355679621 - 2³ = 8355679613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8355679421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4177839810 + 4177839811.

It is an arithmetic number, because the mean of its divisors is an integer number (4177839811).

Almost surely, 2^8355679621 is an apocalyptic number.

It is an amenable number.

8355679621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8355679621 is an equidigital number, since it uses as much as digits as its factorization.

8355679621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 52.

The square root of 8355679621 is about 91409.4066330156. The cubic root of 8355679621 is about 2029.2112429058.

The spelling of 8355679621 in words is "eight billion, three hundred fifty-five million, six hundred seventy-nine thousand, six hundred twenty-one".