1668518686850 has 24 divisors (see below), whose sum is σ = 3286000333188.
Its totient is φ = 628148211200.
The previous prime is 1668518686843. The next prime is 1668518686903. The reversal of 1668518686850 is 586868158661.
It can be written as a sum of positive squares in 6 ways, for example, as 588646476289 + 1079872210561 = 767233^2 + 1039169^2
It is an unprimeable number.
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 11 ways as a sum of consecutive naturals, for example, 981480731 + ... + 981482430.
Almost surely, 21668518686850 is an apocalyptic number.
1668518686850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
1668518686850 is a deficient number, since it is larger than the sum of its proper divisors (1617481646338).
1668518686850 is a wasteful number, since it uses less digits than its factorization.
1668518686850 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1962963190 (or 1962963185 counting only the distinct ones).
The product of its (nonzero) digits is 132710400, while the sum is 68.
The spelling of 1668518686850 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred eighty-six thousand, eight hundred fifty".