20223256777 has 2 divisors, whose sum is σ = 20223256778. Its totient is φ = 20223256776.

The previous prime is 20223256747. The next prime is 20223256787. The reversal of 20223256777 is 77765232202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20221977616 + 1279161 = 142204^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223256777 - 2²³ = 20214868169 is a prime.

It is a super-2 number, since 2×20223256777² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20223256747) 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 as a sum of consecutive naturals, namely, 10111628388 + 10111628389.

It is an arithmetic number, because the mean of its divisors is an integer number (10111628389).

Almost surely, 2^20223256777 is an apocalyptic number.

It is an amenable number.

20223256777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223256777 is an equidigital number, since it uses as much as digits as its factorization.

20223256777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 43.

Adding to 20223256777 its reverse (77765232202), we get a palindrome (97988488979).

The spelling of 20223256777 in words is "twenty billion, two hundred twenty-three million, two hundred fifty-six thousand, seven hundred seventy-seven".