666526080 has 384 divisors, whose sum is σ = 2474438400. Its totient is φ = 152064000.

The previous prime is 666526067. The next prime is 666526087. The reversal of 666526080 is 80625666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666526087) 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 47 ways as a sum of consecutive naturals, for example, 4414005 + ... + 4414155.

It is an arithmetic number, because the mean of its divisors is an integer number (6443850).

Almost surely, 2^666526080 is an apocalyptic number.

666526080 is a gapful number since it is divisible by the number (60) 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 666526080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237219200).

666526080 is an abundant number, since it is smaller than the sum of its proper divisors (1807912320).

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

666526080 is a wasteful number, since it uses less digits than its factorization.

666526080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 666526080 is about 25817.1663820800. The cubic root of 666526080 is about 873.5190535365.

The spelling of 666526080 in words is "six hundred sixty-six million, five hundred twenty-six thousand, eighty".