665141375844 has 189 divisors, whose sum is σ = 1919673382249. Its totient is φ = 201411191520.

The previous prime is 665141375837. The next prime is 665141375869. The reversal of 665141375844 is 448573141566.

The square root of 665141375844 is 815562.

It is a perfect power (a square), and thus also a powerful number.

665141375844 is a `hidden beast` number, since 6 + 6 + 51 + 4 + 1 + 3 + 7 + 584 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 657412856100 + 7728519744 = 810810^2 + 87912^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 484443142 + ... + 484444514.

Almost surely, 2^665141375844 is an apocalyptic number.

665141375844 is the 815562-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665141375844

665141375844 is an abundant number, since it is smaller than the sum of its proper divisors (1254532006405).

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

665141375844 is an equidigital number, since it uses as much as digits as its factorization.

665141375844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790 (or 1389 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 665141375844 in words is "six hundred sixty-five billion, one hundred forty-one million, three hundred seventy-five thousand, eight hundred forty-four".