820459965479 has 16 divisors (see below), whose sum is σ = 1025698384896. Its totient is φ = 637577416800.

The previous prime is 820459965443. The next prime is 820459965497. The reversal of 820459965479 is 974569954028.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 820459965479 - 2²⁴ = 820443188263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820459965179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14488532 + ... + 14545049.

It is an arithmetic number, because the mean of its divisors is an integer number (64106149056).

Almost surely, 2^820459965479 is an apocalyptic number.

820459965479 is a deficient number, since it is larger than the sum of its proper divisors (205238419417).

820459965479 is a wasteful number, since it uses less digits than its factorization.

820459965479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29033966.

The product of its (nonzero) digits is 195955200, while the sum is 68.

The spelling of 820459965479 in words is "eight hundred twenty billion, four hundred fifty-nine million, nine hundred sixty-five thousand, four hundred seventy-nine".