8161665 has 32 divisors (see below), whose sum is σ = 13982976. Its totient is φ = 4055040.

The previous prime is 8161661. The next prime is 8161667. The reversal of 8161665 is 5661618.

It is not a de Polignac number, because 8161665 - 2² = 8161661 is a prime.

It is a super-2 number, since 2×8161665² = 133225551144450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13857 + ... + 14433.

It is an arithmetic number, because the mean of its divisors is an integer number (436968).

Almost surely, 2^8161665 is an apocalyptic number.

It is an amenable number.

8161665 is a deficient number, since it is larger than the sum of its proper divisors (5821311).

8161665 is a wasteful number, since it uses less digits than its factorization.

8161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its digits is 8640, while the sum is 33.

The square root of 8161665 is about 2856.8627898448. The cubic root of 8161665 is about 201.3382340103.

The spelling of 8161665 in words is "eight million, one hundred sixty-one thousand, six hundred sixty-five".