665901096120 has 256 divisors, whose sum is σ = 2467525939200. Its totient is φ = 158626460160.

The previous prime is 665901096101. The next prime is 665901096131. The reversal of 665901096120 is 21690109566.

It is a happy number.

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

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 329742 + ... + 1200221.

It is an arithmetic number, because the mean of its divisors is an integer number (9638773200).

Almost surely, 2^665901096120 is an apocalyptic number.

665901096120 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 665901096120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1233762969600).

665901096120 is an abundant number, since it is smaller than the sum of its proper divisors (1801624843080).

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

665901096120 is a wasteful number, since it uses less digits than its factorization.

665901096120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530027 (or 1530017 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 665901096120 in words is "six hundred sixty-five billion, nine hundred one million, ninety-six thousand, one hundred twenty".