665949544 has 64 divisors (see below), whose sum is σ = 1477123200. Its totient is φ = 278505216.

The previous prime is 665949527. The next prime is 665949553. The reversal of 665949544 is 445949566.

665949544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 665949491 and 665949500.

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, 38122 + ... + 52774.

It is an arithmetic number, because the mean of its divisors is an integer number (23080050).

Almost surely, 2^665949544 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 665949544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738561600).

665949544 is an abundant number, since it is smaller than the sum of its proper divisors (811173656).

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

665949544 is a wasteful number, since it uses less digits than its factorization.

665949544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14714 (or 14710 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 52.

The square root of 665949544 is about 25805.9982174687. The cubic root of 665949544 is about 873.2671201800.

The spelling of 665949544 in words is "six hundred sixty-five million, nine hundred forty-nine thousand, five hundred forty-four".