1665307161 has 32 divisors (see below), whose sum is σ = 2832998400. Its totient is φ = 947071440.

The previous prime is 1665307159. The next prime is 1665307183. The reversal of 1665307161 is 1617035661.

1665307161 is a `hidden beast` number, since 1 + 66 + 530 + 7 + 1 + 61 = 666.

It is not a de Polignac number, because 1665307161 - 2¹ = 1665307159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665307261) 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, 19000 + ... + 60758.

It is an arithmetic number, because the mean of its divisors is an integer number (88531200).

Almost surely, 2^1665307161 is an apocalyptic number.

It is an amenable number.

1665307161 is a deficient number, since it is larger than the sum of its proper divisors (1167691239).

1665307161 is a wasteful number, since it uses less digits than its factorization.

1665307161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41986 (or 41980 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1665307161 is about 40808.1751736095. The cubic root of 1665307161 is about 1185.3086393628.

The spelling of 1665307161 in words is "one billion, six hundred sixty-five million, three hundred seven thousand, one hundred sixty-one".