1688969054881 has 4 divisors (see below), whose sum is σ = 1689013110064. Its totient is φ = 1688924999700.

The previous prime is 1688969054849. The next prime is 1688969054897. The reversal of 1688969054881 is 1884509698861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1688969054881 - 2⁵ = 1688969054849 is a prime.

It is a super-2 number, since 2×1688969054881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688969054281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21970035 + ... + 22046776.

It is an arithmetic number, because the mean of its divisors is an integer number (422253277516).

Almost surely, 2^{1688969054881} is an apocalyptic number.

It is an amenable number.

1688969054881 is a deficient number, since it is larger than the sum of its proper divisors (44055183).

1688969054881 is an equidigital number, since it uses as much as digits as its factorization.

1688969054881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44055182.

The product of its (nonzero) digits is 238878720, while the sum is 73.

The spelling of 1688969054881 in words is "one trillion, six hundred eighty-eight billion, nine hundred sixty-nine million, fifty-four thousand, eight hundred eighty-one".