1656116566720 has 336 divisors, whose sum is σ = 5011652590848. Its totient is φ = 515457546240.

The previous prime is 1656116566667. The next prime is 1656116566777. The reversal of 1656116566720 is 276656116561.

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 47 ways as a sum of consecutive naturals, for example, 128146179 + ... + 128159101.

Almost surely, 2^{1656116566720} is an apocalyptic number.

1656116566720 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 1656116566720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2505826295424).

1656116566720 is an abundant number, since it is smaller than the sum of its proper divisors (3355536024128).

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

1656116566720 is a wasteful number, since it uses less digits than its factorization.

1656116566720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13708 (or 13691 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 1656116566720 in words is "one trillion, six hundred fifty-six billion, one hundred sixteen million, five hundred sixty-six thousand, seven hundred twenty".