665965080 has 192 divisors, whose sum is σ = 2416677120. Its totient is φ = 157651200.

The previous prime is 665965063. The next prime is 665965127. The reversal of 665965080 is 80569566.

665965080 is a `hidden beast` number, since 6 + 6 + 596 + 50 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 168325 + ... + 172235.

It is an arithmetic number, because the mean of its divisors is an integer number (12586860).

Almost surely, 2^665965080 is an apocalyptic number.

665965080 is a gapful number since it is divisible by the number (60) 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 665965080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208338560).

665965080 is an abundant number, since it is smaller than the sum of its proper divisors (1750712040).

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

665965080 is a wasteful number, since it uses less digits than its factorization.

665965080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982 (or 3975 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 665965080 is about 25806.2992310017. The cubic root of 665965080 is about 873.2739109710.

The spelling of 665965080 in words is "six hundred sixty-five million, nine hundred sixty-five thousand, eighty".