665214009888 has 432 divisors, whose sum is σ = 1943492927040. Its totient is φ = 198835845120.

The previous prime is 665214009881. The next prime is 665214009907. The reversal of 665214009888 is 888900412566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665214009881) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2904864558 + ... + 2904864786.

It is an arithmetic number, because the mean of its divisors is an integer number (4498826220).

Almost surely, 2^665214009888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665214009888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971746463520).

665214009888 is an abundant number, since it is smaller than the sum of its proper divisors (1278278917152).

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

665214009888 is a wasteful number, since it uses less digits than its factorization.

665214009888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 665214009888 in words is "six hundred sixty-five billion, two hundred fourteen million, nine thousand, eight hundred eighty-eight".