1663968386927 has 24 divisors (see below), whose sum is σ = 2079537912192. Its totient is φ = 1293493726800.

The previous prime is 1663968386921. The next prime is 1663968386999. The reversal of 1663968386927 is 7296838693661.

It is not a de Polignac number, because 1663968386927 - 2⁴ = 1663968386911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663968386921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13456652 + ... + 13579742.

It is an arithmetic number, because the mean of its divisors is an integer number (86647413008).

Almost surely, 2^{1663968386927} is an apocalyptic number.

1663968386927 is a deficient number, since it is larger than the sum of its proper divisors (415569525265).

1663968386927 is an equidigital number, since it uses as much as digits as its factorization.

1663968386927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123947 (or 123528 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 74.

The spelling of 1663968386927 in words is "one trillion, six hundred sixty-three billion, nine hundred sixty-eight million, three hundred eighty-six thousand, nine hundred twenty-seven".