1667766688380 has 144 divisors (see below), whose sum is σ = 5498020688160. Its totient is φ = 406760818176.

The previous prime is 1667766688339. The next prime is 1667766688403. The reversal of 1667766688380 is 838866677661.

It is a junction number, because it is equal to n+sod(n) for n = 1667766688299 and 1667766688308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3014302 + ... + 3524421.

Almost surely, 2^{1667766688380} is an apocalyptic number.

1667766688380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667766688380 is an abundant number, since it is smaller than the sum of its proper divisors (3830253999780).

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

1667766688380 is a wasteful number, since it uses less digits than its factorization.

1667766688380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6538860 (or 6538855 counting only the distinct ones).

The product of its (nonzero) digits is 585252864, while the sum is 72.

The spelling of 1667766688380 in words is "one trillion, six hundred sixty-seven billion, seven hundred sixty-six million, six hundred eighty-eight thousand, three hundred eighty".