820550077 has 2 divisors, whose sum is σ = 820550078. Its totient is φ = 820550076.

The previous prime is 820550069. The next prime is 820550083. The reversal of 820550077 is 770055028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812592036 + 7958041 = 28506^2 + 2821^2 .

It is a cyclic number.

It is not a de Polignac number, because 820550077 - 2³ = 820550069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820550477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410275038 + 410275039.

It is an arithmetic number, because the mean of its divisors is an integer number (410275039).

Almost surely, 2^820550077 is an apocalyptic number.

It is an amenable number.

820550077 is a deficient number, since it is larger than the sum of its proper divisors (1).

820550077 is an equidigital number, since it uses as much as digits as its factorization.

820550077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 820550077 is about 28645.2452773580. The cubic root of 820550077 is about 936.1994109218.

The spelling of 820550077 in words is "eight hundred twenty million, five hundred fifty thousand, seventy-seven".