22156220477 has 2 divisors, whose sum is σ = 22156220478. Its totient is φ = 22156220476.

The previous prime is 22156220369. The next prime is 22156220507. The reversal of 22156220477 is 77402265122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17225512516 + 4930707961 = 131246^2 + 70219^2 .

It is a cyclic number.

It is not a de Polignac number, because 22156220477 - 2⁸ = 22156220221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22156220477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22156223477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078110238 + 11078110239.

It is an arithmetic number, because the mean of its divisors is an integer number (11078110239).

Almost surely, 2^22156220477 is an apocalyptic number.

It is an amenable number.

22156220477 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156220477 is an equidigital number, since it uses as much as digits as its factorization.

22156220477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 38.

Adding to 22156220477 its reverse (77402265122), we get a palindrome (99558485599).

The spelling of 22156220477 in words is "twenty-two billion, one hundred fifty-six million, two hundred twenty thousand, four hundred seventy-seven".