1663313489478 has 40 divisors (see below), whose sum is σ = 3755505144600. Its totient is φ = 550205472960.

The previous prime is 1663313489399. The next prime is 1663313489531. The reversal of 1663313489478 is 8749843133661.

It is a happy number.

1663313489478 is a `hidden beast` number, since 16 + 63 + 3 + 13 + 4 + 89 + 478 = 666.

It is a super-2 number, since 2×1663313489478² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 39167203 + ... + 39209646.

It is an arithmetic number, because the mean of its divisors is an integer number (93887628615).

Almost surely, 2^{1663313489478} is an apocalyptic number.

1663313489478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1663313489478 is an abundant number, since it is smaller than the sum of its proper divisors (2092191655122).

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

1663313489478 is a wasteful number, since it uses less digits than its factorization.

1663313489478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78376994 (or 78376985 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 1663313489478 in words is "one trillion, six hundred sixty-three billion, three hundred thirteen million, four hundred eighty-nine thousand, four hundred seventy-eight".