165001665530 has 16 divisors (see below), whose sum is σ = 319849382664. Its totient is φ = 60923691840.

The previous prime is 165001665529. The next prime is 165001665533. The reversal of 165001665530 is 35566100561.

It can be written as a sum of positive squares in 4 ways, for example, as 91318191721 + 73683473809 = 302189^2 + 271447^2 .

It is not an unprimeable number, because it can be changed into a prime (165001665533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634621661 + ... + 634621920.

Almost surely, 2^165001665530 is an apocalyptic number.

165001665530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165001665530 is a deficient number, since it is larger than the sum of its proper divisors (154847717134).

165001665530 is a wasteful number, since it uses less digits than its factorization.

165001665530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269243601.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 165001665530 in words is "one hundred sixty-five billion, one million, six hundred sixty-five thousand, five hundred thirty".