165554500 has 48 divisors (see below), whose sum is σ = 382859568. Its totient is φ = 62323200.

The previous prime is 165554497. The next prime is 165554503. The reversal of 165554500 is 5455561.

It is an interprime number because it is at equal distance from previous prime (165554497) and next prime (165554503).

It can be written as a sum of positive squares in 8 ways, for example, as 19289664 + 146264836 = 4392^2 + 12094^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165554503) 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, 1239 + ... + 18238.

It is an arithmetic number, because the mean of its divisors is an integer number (7976241).

Almost surely, 2^165554500 is an apocalyptic number.

165554500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165554500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191429784).

165554500 is an abundant number, since it is smaller than the sum of its proper divisors (217305068).

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

165554500 is a wasteful number, since it uses less digits than its factorization.

165554500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19513 (or 19501 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 165554500 is about 12866.7983585661. The cubic root of 165554500 is about 549.0943774011.

The spelling of 165554500 in words is "one hundred sixty-five million, five hundred fifty-four thousand, five hundred".