660981411840 has 624 divisors, whose sum is σ = 2364695568288. Its totient is φ = 157072490496.

The previous prime is 660981411817. The next prime is 660981411841. The reversal of 660981411840 is 48114189066.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 660981411840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660981411841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 377056404 + ... + 377058156.

Almost surely, 2^660981411840 is an apocalyptic number.

660981411840 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 660981411840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182347784144).

660981411840 is an abundant number, since it is smaller than the sum of its proper divisors (1703714156448).

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

660981411840 is a wasteful number, since it uses less digits than its factorization.

660981411840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 660981411840 in words is "six hundred sixty billion, nine hundred eighty-one million, four hundred eleven thousand, eight hundred forty".