165566500 has 48 divisors (see below), whose sum is σ = 394482816. Its totient is φ = 60204000.

The previous prime is 165566497. The next prime is 165566503. The reversal of 165566500 is 5665561.

It is an interprime number because it is at equal distance from previous prime (165566497) and next prime (165566503).

It is not an unprimeable number, because it can be changed into a prime (165566503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9552 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (8218392).

Almost surely, 2^165566500 is an apocalyptic number.

165566500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165566500 is an abundant number, since it is smaller than the sum of its proper divisors (228916316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165566500 is a wasteful number, since it uses less digits than its factorization.

165566500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30133 (or 30121 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 165566500 is about 12867.2646665871. The cubic root of 165566500 is about 549.1076438749.

It can be divided in two parts, 165 and 566500, that added together give a palindrome (566665).

The spelling of 165566500 in words is "one hundred sixty-five million, five hundred sixty-six thousand, five hundred".