1660121615680 has 112 divisors (see below), whose sum is σ = 4355242577280. Its totient is φ = 597703424000.

The previous prime is 1660121615671. The next prime is 1660121615683. The reversal of 1660121615680 is 865161210661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660121615683) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1979260 + ... + 2690299.

It is an arithmetic number, because the mean of its divisors is an integer number (38886094440).

Almost surely, 2^{1660121615680} is an apocalyptic number.

1660121615680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660121615680 is an abundant number, since it is smaller than the sum of its proper divisors (2695120961600).

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

1660121615680 is a wasteful number, since it uses less digits than its factorization.

1660121615680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4669688 (or 4669678 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 1660121615680 in words is "one trillion, six hundred sixty billion, one hundred twenty-one million, six hundred fifteen thousand, six hundred eighty".