665574000 has 640 divisors, whose sum is σ = 2807820288. Its totient is φ = 131788800.

The previous prime is 665573981. The next prime is 665574031. The reversal of 665574000 is 475566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12557974 + ... + 12558026.

Almost surely, 2^665574000 is an apocalyptic number.

665574000 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 665574000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1403910144).

665574000 is an abundant number, since it is smaller than the sum of its proper divisors (2142246288).

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

665574000 is a wasteful number, since it uses less digits than its factorization.

665574000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 665574000 is about 25798.7208985252. The cubic root of 665574000 is about 873.1029376250.

The spelling of 665574000 in words is "six hundred sixty-five million, five hundred seventy-four thousand".