666061611560 has 128 divisors (see below), whose sum is σ = 1590790924800. Its totient is φ = 250665891840.

The previous prime is 666061611539. The next prime is 666061611619. The reversal of 666061611560 is 65116160666.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5511302 + ... + 5630858.

It is an arithmetic number, because the mean of its divisors is an integer number (12428054100).

Almost surely, 2^666061611560 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 666061611560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795395462400).

666061611560 is an abundant number, since it is smaller than the sum of its proper divisors (924729313240).

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

666061611560 is a wasteful number, since it uses less digits than its factorization.

666061611560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119731 (or 119727 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 666061611560 in words is "six hundred sixty-six billion, sixty-one million, six hundred eleven thousand, five hundred sixty".