819309945553 has 4 divisors (see below), whose sum is σ = 893792667888. Its totient is φ = 744827223220.

The previous prime is 819309945533. The next prime is 819309945599. The reversal of 819309945553 is 355549903918.

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 819309945553 - 2⁵ = 819309945521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 819309945491 and 819309945500.

It is not an unprimeable number, because it can be changed into a prime (819309945533) 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, 37241361151 + ... + 37241361172.

It is an arithmetic number, because the mean of its divisors is an integer number (223448166972).

Almost surely, 2^819309945553 is an apocalyptic number.

It is an amenable number.

819309945553 is a deficient number, since it is larger than the sum of its proper divisors (74482722335).

819309945553 is a wasteful number, since it uses less digits than its factorization.

819309945553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74482722334.

The product of its (nonzero) digits is 26244000, while the sum is 61.

The spelling of 819309945553 in words is "eight hundred nineteen billion, three hundred nine million, nine hundred forty-five thousand, five hundred fifty-three".