665159040 has 768 divisors, whose sum is σ = 2994001920. Its totient is φ = 137355264.

The previous prime is 665159009. The next prime is 665159069. The reversal of 665159040 is 40951566.

665159040 is a `hidden beast` number, since 6 + 65 + 1 + 590 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 665158986 and 665159004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14152297 + ... + 14152343.

It is an arithmetic number, because the mean of its divisors is an integer number (3898440).

Almost surely, 2^665159040 is an apocalyptic number.

665159040 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 665159040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497000960).

665159040 is an abundant number, since it is smaller than the sum of its proper divisors (2328842880).

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

665159040 is a wasteful number, since it uses less digits than its factorization.

665159040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 665159040 is about 25790.6773854430. The cubic root of 665159040 is about 872.9214511111.

The spelling of 665159040 in words is "six hundred sixty-five million, one hundred fifty-nine thousand, forty".