1661677358784 has 28 divisors (see below), whose sum is σ = 4396521345624. Its totient is φ = 553892452864.

The previous prime is 1661677358707. The next prime is 1661677358791. The reversal of 1661677358784 is 4878537761661.

It is a super-2 number, since 2×1661677358784² (a number of 25 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 4327284597 + ... + 4327284980.

Almost surely, 2^{1661677358784} is an apocalyptic number.

It is an amenable number.

1661677358784 is an abundant number, since it is smaller than the sum of its proper divisors (2734843986840).

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

1661677358784 is an equidigital number, since it uses as much as digits as its factorization.

1661677358784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8654569592 (or 8654569582 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 69.

The spelling of 1661677358784 in words is "one trillion, six hundred sixty-one billion, six hundred seventy-seven million, three hundred fifty-eight thousand, seven hundred eighty-four".