1666868355136 has 28 divisors (see below), whose sum is σ = 3384614965072. Its totient is φ = 814051986048.

The previous prime is 1666868355107. The next prime is 1666868355143. The reversal of 1666868355136 is 6315538686661.

It is a super-2 number, since 2×1666868355136² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302843970 + ... + 302849473.

Almost surely, 2^{1666868355136} is an apocalyptic number.

1666868355136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666868355136 is an abundant number, since it is smaller than the sum of its proper divisors (1717746609936).

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

1666868355136 is an equidigital number, since it uses as much as digits as its factorization.

1666868355136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605693498 (or 605693488 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 64.

The spelling of 1666868355136 in words is "one trillion, six hundred sixty-six billion, eight hundred sixty-eight million, three hundred fifty-five thousand, one hundred thirty-six".