1686707768988 has 108 divisors (see below), whose sum is σ = 4698152803344. Its totient is φ = 509848416000.

The previous prime is 1686707768939. The next prime is 1686707769029. The reversal of 1686707768988 is 8898677076861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1263945 + ... + 2229567.

Almost surely, 2^{1686707768988} is an apocalyptic number.

1686707768988 is a gapful number since it is divisible by the number (18) 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 1686707768988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349076401672).

1686707768988 is an abundant number, since it is smaller than the sum of its proper divisors (3011445034356).

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

1686707768988 is a wasteful number, since it uses less digits than its factorization.

1686707768988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966056 (or 966040 counting only the distinct ones).

The product of its (nonzero) digits is 2731180032, while the sum is 81.

The spelling of 1686707768988 in words is "one trillion, six hundred eighty-six billion, seven hundred seven million, seven hundred sixty-eight thousand, nine hundred eighty-eight".