660798356400 has 720 divisors, whose sum is σ = 2926913609984. Its totient is φ = 139419325440.

The previous prime is 660798356353. The next prime is 660798356419. The reversal of 660798356400 is 4653897066.

660798356400 is a `hidden beast` number, since 6 + 6 + 0 + 79 + 8 + 3 + 564 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8807847 + ... + 8882553.

Almost surely, 2^660798356400 is an apocalyptic number.

660798356400 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 660798356400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463456804992).

660798356400 is an abundant number, since it is smaller than the sum of its proper divisors (2266115253584).

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

660798356400 is a wasteful number, since it uses less digits than its factorization.

660798356400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74760 (or 74737 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 660798356400 in words is "six hundred sixty billion, seven hundred ninety-eight million, three hundred fifty-six thousand, four hundred".