22782365521 has 2 divisors, whose sum is σ = 22782365522. Its totient is φ = 22782365520.

The previous prime is 22782365503. The next prime is 22782365657. The reversal of 22782365521 is 12556328722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21071715921 + 1710649600 = 145161^2 + 41360^2 .

It is a cyclic number.

It is not a de Polignac number, because 22782365521 - 2¹⁵ = 22782332753 is a prime.

It is not a weakly prime, because it can be changed into another prime (22782365821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11391182760 + 11391182761.

It is an arithmetic number, because the mean of its divisors is an integer number (11391182761).

Almost surely, 2^22782365521 is an apocalyptic number.

It is an amenable number.

22782365521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22782365521 is an equidigital number, since it uses as much as digits as its factorization.

22782365521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 43.

The spelling of 22782365521 in words is "twenty-two billion, seven hundred eighty-two million, three hundred sixty-five thousand, five hundred twenty-one".