1660660420608 has 936 divisors, whose sum is σ = 6072145567200. Its totient is φ = 445962682368.

The previous prime is 1660660420571. The next prime is 1660660420687. The reversal of 1660660420608 is 8060240660661.

1660660420608 is a `hidden beast` number, since 16 + 6 + 0 + 6 + 6 + 0 + 4 + 20 + 608 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13076066241 + ... + 13076066367.

Almost surely, 2^{1660660420608} is an apocalyptic number.

1660660420608 is a gapful number since it is divisible by the number (18) 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 1660660420608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3036072783600).

1660660420608 is an abundant number, since it is smaller than the sum of its proper divisors (4411485146592).

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

1660660420608 is an equidigital number, since it uses as much as digits as its factorization.

1660660420608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 1660660420608 in words is "one trillion, six hundred sixty billion, six hundred sixty million, four hundred twenty thousand, six hundred eight".