10505515665 has 16 divisors (see below), whose sum is σ = 16846272000. Its totient is φ = 5590459392.

The previous prime is 10505515661. The next prime is 10505515667. The reversal of 10505515665 is 56651550501.

It is not a de Polignac number, because 10505515665 - 2² = 10505515661 is a prime.

It is a super-2 number, since 2×10505515665² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10505515661) 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, 773185 + ... + 786654.

It is an arithmetic number, because the mean of its divisors is an integer number (1052892000).

Almost surely, 2^10505515665 is an apocalyptic number.

10505515665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10505515665 is a deficient number, since it is larger than the sum of its proper divisors (6340756335).

10505515665 is a wasteful number, since it uses less digits than its factorization.

10505515665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560296.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 10505515665 in words is "ten billion, five hundred five million, five hundred fifteen thousand, six hundred sixty-five".