665496000 has 560 divisors, whose sum is σ = 2684922240. Its totient is φ = 161740800.

The previous prime is 665495977. The next prime is 665496011. The reversal of 665496000 is 694566.

It is a happy number.

665496000 is a `hidden beast` number, since 6 + 6 + 5 + 49 + 600 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8423961 + ... + 8424039.

It is an arithmetic number, because the mean of its divisors is an integer number (4794504).

Almost surely, 2^665496000 is an apocalyptic number.

665496000 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 665496000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342461120).

665496000 is an abundant number, since it is smaller than the sum of its proper divisors (2019426240).

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

665496000 is a wasteful number, since it uses less digits than its factorization.

665496000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 665496000 is about 25797.2091513791. The cubic root of 665496000 is about 873.0688293767.

The spelling of 665496000 in words is "six hundred sixty-five million, four hundred ninety-six thousand".