10815509805 has 16 divisors (see below), whose sum is σ = 17392662144. Its totient is φ = 5738989760.

The previous prime is 10815509791. The next prime is 10815509813. The reversal of 10815509805 is 50890551801.

It is not a de Polignac number, because 10815509805 - 2¹² = 10815505709 is a prime.

It is a super-2 number, since 2×10815509805² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827081 + ... + 1832990.

It is an arithmetic number, because the mean of its divisors is an integer number (1087041384).

Almost surely, 2^10815509805 is an apocalyptic number.

10815509805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10815509805 is a deficient number, since it is larger than the sum of its proper divisors (6577152339).

10815509805 is a wasteful number, since it uses less digits than its factorization.

10815509805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660276.

The product of its (nonzero) digits is 72000, while the sum is 42.

The spelling of 10815509805 in words is "ten billion, eight hundred fifteen million, five hundred nine thousand, eight hundred five".