660511511200 has 72 divisors (see below), whose sum is σ = 1613590911072. Its totient is φ = 264021553920.

The previous prime is 660511511123. The next prime is 660511511263. The reversal of 660511511200 is 2115115066.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 872307 + ... + 1442893.

It is an arithmetic number, because the mean of its divisors is an integer number (22410984876).

Almost surely, 2^660511511200 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 660511511200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806795455536).

660511511200 is an abundant number, since it is smaller than the sum of its proper divisors (953079399872).

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

660511511200 is a wasteful number, since it uses less digits than its factorization.

660511511200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572054 (or 572041 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 660511511200 its reverse (2115115066), we get a palindrome (662626626266).

It can be divided in two parts, 660511 and 511200, that added together give a palindrome (1171711).

The spelling of 660511511200 in words is "six hundred sixty billion, five hundred eleven million, five hundred eleven thousand, two hundred".