660610969680 has 160 divisors (see below), whose sum is σ = 2114404098048. Its totient is φ = 170444044800.

The previous prime is 660610969639. The next prime is 660610969687. The reversal of 660610969680 is 86969016066.

It is a self number, because there is not a number n which added to its sum of digits gives 660610969680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660610969687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67632157 + ... + 67641923.

Almost surely, 2^660610969680 is an apocalyptic number.

660610969680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660610969680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057202049024).

660610969680 is an abundant number, since it is smaller than the sum of its proper divisors (1453793128368).

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

660610969680 is a wasteful number, since it uses less digits than its factorization.

660610969680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18905 (or 18899 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 57.

The spelling of 660610969680 in words is "six hundred sixty billion, six hundred ten million, nine hundred sixty-nine thousand, six hundred eighty".