66603500 has 48 divisors (see below), whose sum is σ = 150189312. Its totient is φ = 25776000.

The previous prime is 66603497. The next prime is 66603503. The reversal of 66603500 is 530666.

It is an interprime number because it is at equal distance from previous prime (66603497) and next prime (66603503).

It is a self number, because there is not a number n which added to its sum of digits gives 66603500.

It is not an unprimeable number, because it can be changed into a prime (66603503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13352 + ... + 17648.

It is an arithmetic number, because the mean of its divisors is an integer number (3128944).

Almost surely, 2^66603500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66603500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75094656).

66603500 is an abundant number, since it is smaller than the sum of its proper divisors (83585812).

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

66603500 is a wasteful number, since it uses less digits than its factorization.

66603500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347 (or 4335 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 66603500 is about 8161.0967400221. The cubic root of 66603500 is about 405.3520284280.

The spelling of 66603500 in words is "sixty-six million, six hundred three thousand, five hundred".