665887068 has 432 divisors, whose sum is σ = 2342366208. Its totient is φ = 163296000.

The previous prime is 665887043. The next prime is 665887081. The reversal of 665887068 is 860788566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16241128 + ... + 16241168.

It is an arithmetic number, because the mean of its divisors is an integer number (5422144).

Almost surely, 2^665887068 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 665887068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171183104).

665887068 is an abundant number, since it is smaller than the sum of its proper divisors (1676479140).

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

665887068 is a wasteful number, since it uses less digits than its factorization.

665887068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The square root of 665887068 is about 25804.7876953096. The cubic root of 665887068 is about 873.2398108323.

The spelling of 665887068 in words is "six hundred sixty-five million, eight hundred eighty-seven thousand, sixty-eight".