66065500 has 48 divisors (see below), whose sum is σ = 146397888. Its totient is φ = 26040000.

The previous prime is 66065491. The next prime is 66065513. The reversal of 66065500 is 556066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34570 + ... + 36430.

It is an arithmetic number, because the mean of its divisors is an integer number (3049956).

Almost surely, 2^66065500 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 66065500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73198944).

66065500 is an abundant number, since it is smaller than the sum of its proper divisors (80332388).

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

66065500 is a wasteful number, since it uses less digits than its factorization.

66065500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66065500 is about 8128.0686512849. The cubic root of 66065500 is about 404.2576453472.

The spelling of 66065500 in words is "sixty-six million, sixty-five thousand, five hundred".