819309945556 has 12 divisors (see below), whose sum is σ = 1434619763892. Its totient is φ = 409418584448.

The previous prime is 819309945533. The next prime is 819309945599. The reversal of 819309945556 is 655549903918.

It can be written as a sum of positive squares in 2 ways, for example, as 429397120656 + 389912824900 = 655284^2 + 624430^2 .

It is a super-3 number, since 3×819309945556³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59089285 + ... + 59103148.

It is an arithmetic number, because the mean of its divisors is an integer number (119551646991).

Almost surely, 2^819309945556 is an apocalyptic number.

It is an amenable number.

819309945556 is a deficient number, since it is larger than the sum of its proper divisors (615309818336).

819309945556 is a wasteful number, since it uses less digits than its factorization.

819309945556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118194170 (or 118194168 counting only the distinct ones).

The product of its (nonzero) digits is 52488000, while the sum is 64.

The spelling of 819309945556 in words is "eight hundred nineteen billion, three hundred nine million, nine hundred forty-five thousand, five hundred fifty-six".