1660666523040 has 960 divisors, whose sum is σ = 7009666836480. Its totient is φ = 362259578880.

The previous prime is 1660666523029. The next prime is 1660666523051. The reversal of 1660666523040 is 403256660661.

It is an interprime number because it is at equal distance from previous prime (1660666523029) and next prime (1660666523051).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 205295316 + ... + 205303404.

It is an arithmetic number, because the mean of its divisors is an integer number (7301736288).

Almost surely, 2^{1660666523040} is an apocalyptic number.

1660666523040 is a gapful number since it is divisible by the number (10) 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 1660666523040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3504833418240).

1660666523040 is an abundant number, since it is smaller than the sum of its proper divisors (5349000313440).

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

1660666523040 is a wasteful number, since it uses less digits than its factorization.

1660666523040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227 (or 8210 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 1660666523040 in words is "one trillion, six hundred sixty billion, six hundred sixty-six million, five hundred twenty-three thousand, forty".