1678748896656 has 120 divisors (see below), whose sum is σ = 5089501846520. Its totient is φ = 516538024704.

The previous prime is 1678748896651. The next prime is 1678748896661. The reversal of 1678748896656 is 6566988478761.

1678748896656 is a `hidden beast` number, since 1 + 6 + 7 + 87 + 488 + 9 + 6 + 6 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (1678748896651) and next prime (1678748896661).

It can be written as a sum of positive squares in 4 ways, for example, as 1070479929600 + 608268967056 = 1034640^2 + 779916^2 .

It is not an unprimeable number, because it can be changed into a prime (1678748896651) 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, 2336791 + ... + 2969526.

Almost surely, 2^{1678748896656} is an apocalyptic number.

1678748896656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1678748896656 is an abundant number, since it is smaller than the sum of its proper divisors (3410752949864).

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

1678748896656 is a wasteful number, since it uses less digits than its factorization.

1678748896656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306370 (or 5306335 counting only the distinct ones).

The product of its digits is 5852528640, while the sum is 81.

The spelling of 1678748896656 in words is "one trillion, six hundred seventy-eight billion, seven hundred forty-eight million, eight hundred ninety-six thousand, six hundred fifty-six".