665356124160 has 1440 divisors, whose sum is σ = 2912905562112. Its totient is φ = 136744796160.

The previous prime is 665356124119. The next prime is 665356124221. The reversal of 665356124160 is 61421653566.

665356124160 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 561 + 24 + 1 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3153346455 + ... + 3153346665.

Almost surely, 2^665356124160 is an apocalyptic number.

665356124160 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 665356124160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456452781056).

665356124160 is an abundant number, since it is smaller than the sum of its proper divisors (2247549437952).

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

665356124160 is a wasteful number, since it uses less digits than its factorization.

665356124160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 665356124160 in words is "six hundred sixty-five billion, three hundred fifty-six million, one hundred twenty-four thousand, one hundred sixty".