1686668352020 has 24 divisors (see below), whose sum is σ = 3542029293768. Its totient is φ = 674662435200.

The previous prime is 1686668352001. The next prime is 1686668352043. The reversal of 1686668352020 is 202538666861.

It can be written as a sum of positive squares in 4 ways, for example, as 1770894724 + 1684897457296 = 42082^2 + 1298036^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3962750 + ... + 4367690.

It is an arithmetic number, because the mean of its divisors is an integer number (147584553907).

Almost surely, 2^{1686668352020} is an apocalyptic number.

1686668352020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686668352020 is an abundant number, since it is smaller than the sum of its proper divisors (1855360941748).

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

1686668352020 is a wasteful number, since it uses less digits than its factorization.

1686668352020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613211 (or 613209 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 1686668352020 in words is "one trillion, six hundred eighty-six billion, six hundred sixty-eight million, three hundred fifty-two thousand, twenty".