1667766688381 has 16 divisors (see below), whose sum is σ = 1768048128000. Its totient is φ = 1569930970608.

The previous prime is 1667766688339. The next prime is 1667766688403. The reversal of 1667766688381 is 1838866677661.

It is a cyclic number.

It is not a de Polignac number, because 1667766688381 - 2⁷ = 1667766688253 is a prime.

It is a super-2 number, since 2×1667766688381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667766688481) 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 15 ways as a sum of consecutive naturals, for example, 937081 + ... + 2052718.

It is an arithmetic number, because the mean of its divisors is an integer number (110503008000).

Almost surely, 2^{1667766688381} is an apocalyptic number.

It is an amenable number.

1667766688381 is a deficient number, since it is larger than the sum of its proper divisors (100281439619).

1667766688381 is a wasteful number, since it uses less digits than its factorization.

1667766688381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990208.

The product of its digits is 585252864, while the sum is 73.

The spelling of 1667766688381 in words is "one trillion, six hundred sixty-seven billion, seven hundred sixty-six million, six hundred eighty-eight thousand, three hundred eighty-one".