654321066 has 64 divisors (see below), whose sum is σ = 1576931328. Its totient is φ = 176951808.

The previous prime is 654321049. The next prime is 654321071. The reversal of 654321066 is 660123456.

It is a super-3 number, since 3×654321066³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90211 + ... + 97193.

It is an arithmetic number, because the mean of its divisors is an integer number (24639552).

Almost surely, 2^654321066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654321066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788465664).

654321066 is an abundant number, since it is smaller than the sum of its proper divisors (922610262).

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

654321066 is a wasteful number, since it uses less digits than its factorization.

654321066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 654321066 is about 25579.7002718953. The cubic root of 654321066 is about 868.1543937737.

The spelling of 654321066 in words is "six hundred fifty-four million, three hundred twenty-one thousand, sixty-six".