666441748 has 18 divisors (see below), whose sum is σ = 1356685386. Its totient is φ = 285617808.

The previous prime is 666441691. The next prime is 666441781. The reversal of 666441748 is 847144666.

It can be written as a sum of positive squares in only one way, i.e., 538796944 + 127644804 = 23212^2 + 11298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666441698 and 666441707.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1699911 + ... + 1700302.

Almost surely, 2^666441748 is an apocalyptic number.

It is an amenable number.

666441748 is an abundant number, since it is smaller than the sum of its proper divisors (690243638).

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

666441748 is a wasteful number, since it uses less digits than its factorization.

666441748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400231 (or 3400222 counting only the distinct ones).

The product of its digits is 774144, while the sum is 46.

The square root of 666441748 is about 25815.5330760378. The cubic root of 666441748 is about 873.4822114093.

The spelling of 666441748 in words is "six hundred sixty-six million, four hundred forty-one thousand, seven hundred forty-eight".