665549955000 has 960 divisors, whose sum is σ = 2755637913600. Its totient is φ = 141678720000.

The previous prime is 665549954999. The next prime is 665549955011. The reversal of 665549955000 is 559945566.

665549955000 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 49 + 95 + 500 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 365084089 + ... + 365085911.

It is an arithmetic number, because the mean of its divisors is an integer number (2870456160).

Almost surely, 2^665549955000 is an apocalyptic number.

665549955000 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 665549955000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1377818956800).

665549955000 is an abundant number, since it is smaller than the sum of its proper divisors (2090087958600).

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

665549955000 is a wasteful number, since it uses less digits than its factorization.

665549955000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 7290000, while the sum is 54.

The spelling of 665549955000 in words is "six hundred sixty-five billion, five hundred forty-nine million, nine hundred fifty-five thousand".