10509161665 has 16 divisors (see below), whose sum is σ = 13466695680. Its totient is φ = 7855565760.

The previous prime is 10509161651. The next prime is 10509161671. The reversal of 10509161665 is 56616190501.

It is not a de Polignac number, because 10509161665 - 2¹⁷ = 10509030593 is a prime.

It is a super-2 number, since 2×10509161665² (a number of 21 digits) contains 22 as substring.

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, 1164489 + ... + 1173478.

It is an arithmetic number, because the mean of its divisors is an integer number (841668480).

Almost surely, 2^10509161665 is an apocalyptic number.

It is an amenable number.

10509161665 is a deficient number, since it is larger than the sum of its proper divisors (2957534015).

10509161665 is a wasteful number, since it uses less digits than its factorization.

10509161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338032.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 10509161665 in words is "ten billion, five hundred nine million, one hundred sixty-one thousand, six hundred sixty-five".