665612080 has 160 divisors (see below), whose sum is σ = 1828454400. Its totient is φ = 225227520.

The previous prime is 665612069. The next prime is 665612113. The reversal of 665612080 is 80216566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3484785 + ... + 3484975.

It is an arithmetic number, because the mean of its divisors is an integer number (11427840).

Almost surely, 2^665612080 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 665612080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914227200).

665612080 is an abundant number, since it is smaller than the sum of its proper divisors (1162842320).

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

665612080 is a wasteful number, since it uses less digits than its factorization.

665612080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 665612080 is about 25799.4589090547. The cubic root of 665612080 is about 873.1195884786.

The spelling of 665612080 in words is "six hundred sixty-five million, six hundred twelve thousand, eighty".