666077544 has 192 divisors, whose sum is σ = 2120489280. Its totient is φ = 186624000.

The previous prime is 666077543. The next prime is 666077551. The reversal of 666077544 is 445770666.

It is a happy number.

666077544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666077544.

It is not an unprimeable number, because it can be changed into a prime (666077543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 820899 + ... + 821709.

It is an arithmetic number, because the mean of its divisors is an integer number (11044215).

Almost surely, 2^666077544 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 666077544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060244640).

666077544 is an abundant number, since it is smaller than the sum of its proper divisors (1454411736).

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

666077544 is a wasteful number, since it uses less digits than its factorization.

666077544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 666077544 is about 25808.4781418820. The cubic root of 666077544 is about 873.3230658752.

The spelling of 666077544 in words is "six hundred sixty-six million, seventy-seven thousand, five hundred forty-four".