820320312977 has 4 divisors (see below), whose sum is σ = 894894886896. Its totient is φ = 745745739060.

The previous prime is 820320312907. The next prime is 820320313051. The reversal of 820320312977 is 779213023028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820320312977 - 2¹⁸ = 820320050833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820320312907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37287286943 + ... + 37287286964.

It is an arithmetic number, because the mean of its divisors is an integer number (223723721724).

Almost surely, 2^820320312977 is an apocalyptic number.

It is an amenable number.

820320312977 is a deficient number, since it is larger than the sum of its proper divisors (74574573919).

820320312977 is a wasteful number, since it uses less digits than its factorization.

820320312977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74574573918.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 820320312977 in words is "eight hundred twenty billion, three hundred twenty million, three hundred twelve thousand, nine hundred seventy-seven".