665501633152 has 64 divisors (see below), whose sum is σ = 1354456857600. Its totient is φ = 325564171264.

The previous prime is 665501633089. The next prime is 665501633161. The reversal of 665501633152 is 251336105566.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 665501633099 and 665501633108.

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 7 ways as a sum of consecutive naturals, for example, 20191278 + ... + 20224210.

It is an arithmetic number, because the mean of its divisors is an integer number (21163388400).

Almost surely, 2^665501633152 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 665501633152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (677228428800).

665501633152 is an abundant number, since it is smaller than the sum of its proper divisors (688955224448).

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

665501633152 is a wasteful number, since it uses less digits than its factorization.

665501633152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36353 (or 36341 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 665501633152 in words is "six hundred sixty-five billion, five hundred one million, six hundred thirty-three thousand, one hundred fifty-two".