665169120000 has 1620 divisors, whose sum is σ = 3044799333576. Its totient is φ = 138055680000.

The previous prime is 665169119977. The next prime is 665169120013. The reversal of 665169120000 is 21961566.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 776159572 + ... + 776160428.

Almost surely, 2^665169120000 is an apocalyptic number.

665169120000 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 665169120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522399666788).

665169120000 is an abundant number, since it is smaller than the sum of its proper divisors (2379630213576).

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

665169120000 is a wasteful number, since it uses less digits than its factorization.

665169120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 665169120000 in words is "six hundred sixty-five billion, one hundred sixty-nine million, one hundred twenty thousand".