195216660 has 72 divisors (see below), whose sum is σ = 595675080. Its totient is φ = 51748608.

The previous prime is 195216631. The next prime is 195216683. The reversal of 195216660 is 66612591.

It can be written as a sum of positive squares in 4 ways, for example, as 39765636 + 155451024 = 6306^2 + 12468^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28006 + ... + 34274.

It is an arithmetic number, because the mean of its divisors is an integer number (8273265).

Almost surely, 2^195216660 is an apocalyptic number.

195216660 is a gapful number since it is divisible by the number (10) 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 195216660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297837540).

195216660 is an abundant number, since it is smaller than the sum of its proper divisors (400458420).

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

195216660 is a wasteful number, since it uses less digits than its factorization.

195216660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457 (or 6452 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 195216660 is about 13971.9955625530. The cubic root of 195216660 is about 580.1036873682.

The spelling of 195216660 in words is "one hundred ninety-five million, two hundred sixteen thousand, six hundred sixty".