1660666432320 has 1344 divisors, whose sum is σ = 6997808102400. Its totient is φ = 374164697088.

The previous prime is 1660666432319. The next prime is 1660666432339. The reversal of 1660666432320 is 232346660661.

It is a tau number, because it is divible by the number of its divisors (1344).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2709080334 + ... + 2709080946.

Almost surely, 2^{1660666432320} is an apocalyptic number.

1660666432320 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 1660666432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3498904051200).

1660666432320 is an abundant number, since it is smaller than the sum of its proper divisors (5337141670080).

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

1660666432320 is an frugal number, since it uses more digits than its factorization.

1660666432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 1660666432320 in words is "one trillion, six hundred sixty billion, six hundred sixty-six million, four hundred thirty-two thousand, three hundred twenty".