820374071009 has 2 divisors, whose sum is σ = 820374071010. Its totient is φ = 820374071008.

The previous prime is 820374070991. The next prime is 820374071039. The reversal of 820374071009 is 900170473028.

820374071009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 429627811600 + 390746259409 = 655460^2 + 625097^2 .

It is a cyclic number.

It is not a de Polignac number, because 820374071009 - 2¹² = 820374066913 is a prime.

It is not a weakly prime, because it can be changed into another prime (820374071039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410187035504 + 410187035505.

It is an arithmetic number, because the mean of its divisors is an integer number (410187035505).

Almost surely, 2^820374071009 is an apocalyptic number.

It is an amenable number.

820374071009 is a deficient number, since it is larger than the sum of its proper divisors (1).

820374071009 is an equidigital number, since it uses as much as digits as its factorization.

820374071009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 820374071009 in words is "eight hundred twenty billion, three hundred seventy-four million, seventy-one thousand, nine".