660167221120 has 128 divisors (see below), whose sum is σ = 1738734374880. Its totient is φ = 237683712000.

The previous prime is 660167221117. The next prime is 660167221127. The reversal of 660167221120 is 21122761066.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660167221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246814 + ... + 1175266.

Almost surely, 2^660167221120 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 660167221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869367187440).

660167221120 is an abundant number, since it is smaller than the sum of its proper divisors (1078567153760).

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

660167221120 is a wasteful number, since it uses less digits than its factorization.

660167221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928584 (or 928572 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

Adding to 660167221120 its reverse (21122761066), we get a palindrome (681289982186).

The spelling of 660167221120 in words is "six hundred sixty billion, one hundred sixty-seven million, two hundred twenty-one thousand, one hundred twenty".