1668218753690 has 16 divisors (see below), whose sum is σ = 3106338369480. Its totient is φ = 644277587520.

The previous prime is 1668218753671. The next prime is 1668218753717. The reversal of 1668218753690 is 963578128661.

It can be written as a sum of positive squares in 4 ways, for example, as 1476023316889 + 192195436801 = 1214917^2 + 438401^2 .

It is a super-2 number, since 2×1668218753690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2876238941 + ... + 2876239520.

Almost surely, 2^{1668218753690} is an apocalyptic number.

1668218753690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668218753690 is a deficient number, since it is larger than the sum of its proper divisors (1438119615790).

1668218753690 is a wasteful number, since it uses less digits than its factorization.

1668218753690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752478497.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 1668218753690 in words is "one trillion, six hundred sixty-eight billion, two hundred eighteen million, seven hundred fifty-three thousand, six hundred ninety".