10815999993 has 12 divisors (see below), whose sum is σ = 16161839460. Its totient is φ = 6962022816.

The previous prime is 10815999977. The next prime is 10816000001. The reversal of 10815999993 is 39999951801.

It can be written as a sum of positive squares in 2 ways, for example, as 3007096569 + 7808903424 = 54837^2 + 88368^2 .

It is not a de Polignac number, because 10815999993 - 2⁴ = 10815999977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10815999993.

It is not an unprimeable number, because it can be changed into a prime (10815999193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20720046 + ... + 20720567.

It is an arithmetic number, because the mean of its divisors is an integer number (1346819955).

Almost surely, 2^10815999993 is an apocalyptic number.

It is an amenable number.

10815999993 is a deficient number, since it is larger than the sum of its proper divisors (5345839467).

10815999993 is a wasteful number, since it uses less digits than its factorization.

10815999993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41440648 (or 41440645 counting only the distinct ones).

The product of its (nonzero) digits is 7085880, while the sum is 63.

The spelling of 10815999993 in words is "ten billion, eight hundred fifteen million, nine hundred ninety-nine thousand, nine hundred ninety-three".