666419616 has 96 divisors (see below), whose sum is σ = 1967353920. Its totient is φ = 219439872.

The previous prime is 666419609. The next prime is 666419639. The reversal of 666419616 is 616914666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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, 67066 + ... + 76358.

It is an arithmetic number, because the mean of its divisors is an integer number (20493270).

Almost surely, 2^666419616 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 666419616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983676960).

666419616 is an abundant number, since it is smaller than the sum of its proper divisors (1300934304).

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

666419616 is a wasteful number, since it uses less digits than its factorization.

666419616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395 (or 9381 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 666419616 is about 25815.1044158260. The cubic root of 666419616 is about 873.4725420859.

The spelling of 666419616 in words is "six hundred sixty-six million, four hundred nineteen thousand, six hundred sixteen".