665641350 has 144 divisors (see below), whose sum is σ = 2018643120. Its totient is φ = 155769600.

The previous prime is 665641343. The next prime is 665641357. The reversal of 665641350 is 53146566.

665641350 is a `hidden beast` number, since 6 + 6 + 5 + 641 + 3 + 5 + 0 = 666.

665641350 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665641343) and next prime (665641357).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665641357) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 141232 + ... + 145868.

It is an arithmetic number, because the mean of its divisors is an integer number (14018355).

Almost surely, 2^665641350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665641350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009321560).

665641350 is an abundant number, since it is smaller than the sum of its proper divisors (1353001770).

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

665641350 is a wasteful number, since it uses less digits than its factorization.

665641350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695 (or 4687 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 665641350 is about 25800.0261627774. The cubic root of 665641350 is about 873.1323866417.

The spelling of 665641350 in words is "six hundred sixty-five million, six hundred forty-one thousand, three hundred fifty".