660440646306 has 96 divisors (see below), whose sum is σ = 1699404715008. Its totient is φ = 188312538960.

The previous prime is 660440646259. The next prime is 660440646317. The reversal of 660440646306 is 603646044066.

660440646306 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 4 + 0 + 6 + 4 + 630 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1472691 + ... + 1868073.

It is an arithmetic number, because the mean of its divisors is an integer number (17702132448).

Almost surely, 2^660440646306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660440646306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849702357504).

660440646306 is an abundant number, since it is smaller than the sum of its proper divisors (1038964068702).

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

660440646306 is a wasteful number, since it uses less digits than its factorization.

660440646306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395898 (or 395886 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 45.

The spelling of 660440646306 in words is "six hundred sixty billion, four hundred forty million, six hundred forty-six thousand, three hundred six".