815230533509 has 16 divisors (see below), whose sum is σ = 954452491776. Its totient is φ = 681699984000.

The previous prime is 815230533499. The next prime is 815230533571. The reversal of 815230533509 is 905335032518.

It is not a de Polignac number, because 815230533509 - 2¹² = 815230529413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815230533509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815230533409) 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, 13043684 + ... + 13106034.

It is an arithmetic number, because the mean of its divisors is an integer number (59653280736).

Almost surely, 2^815230533509 is an apocalyptic number.

It is an amenable number.

815230533509 is a deficient number, since it is larger than the sum of its proper divisors (139221958267).

815230533509 is a wasteful number, since it uses less digits than its factorization.

815230533509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107956.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 815230533509 in words is "eight hundred fifteen billion, two hundred thirty million, five hundred thirty-three thousand, five hundred nine".