820377530477 has 2 divisors, whose sum is σ = 820377530478. Its totient is φ = 820377530476.

The previous prime is 820377530363. The next prime is 820377530521. The reversal of 820377530477 is 774035773028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 775070705161 + 45306825316 = 880381^2 + 212854^2 .

It is a cyclic number.

It is not a de Polignac number, because 820377530477 - 2¹⁰ = 820377529453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820377530677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410188765238 + 410188765239.

It is an arithmetic number, because the mean of its divisors is an integer number (410188765239).

Almost surely, 2^820377530477 is an apocalyptic number.

It is an amenable number.

820377530477 is a deficient number, since it is larger than the sum of its proper divisors (1).

820377530477 is an equidigital number, since it uses as much as digits as its factorization.

820377530477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6914880, while the sum is 53.

The spelling of 820377530477 in words is "eight hundred twenty billion, three hundred seventy-seven million, five hundred thirty thousand, four hundred seventy-seven".