1668686703685 has 8 divisors (see below), whose sum is σ = 2003007351960. Its totient is φ = 1334560491264.

The previous prime is 1668686703679. The next prime is 1668686703701. The reversal of 1668686703685 is 5863076868661.

It can be written as a sum of positive squares in 4 ways, for example, as 290218160961 + 1378468542724 = 538719^2 + 1174082^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668686703685 - 2¹¹ = 1668686701637 is a prime.

It is a super-2 number, since 2×1668686703685² (a number of 25 digits) contains 22 as substring.

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, 48590080 + ... + 48624409.

It is an arithmetic number, because the mean of its divisors is an integer number (250375918995).

Almost surely, 2^{1668686703685} is an apocalyptic number.

It is an amenable number.

1668686703685 is a deficient number, since it is larger than the sum of its proper divisors (334320648275).

1668686703685 is an equidigital number, since it uses as much as digits as its factorization.

1668686703685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97217927.

The product of its (nonzero) digits is 418037760, while the sum is 70.

The spelling of 1668686703685 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred eighty-five".