1678748896655 has 4 divisors (see below), whose sum is σ = 2014498675992. Its totient is φ = 1342999117320.

The previous prime is 1678748896651. The next prime is 1678748896661. The reversal of 1678748896655 is 5566988478761.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1678748896655 - 2² = 1678748896651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1678748896655.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 167874889661 + ... + 167874889670.

It is an arithmetic number, because the mean of its divisors is an integer number (503624668998).

Almost surely, 2^{1678748896655} is an apocalyptic number.

1678748896655 is a deficient number, since it is larger than the sum of its proper divisors (335749779337).

1678748896655 is an equidigital number, since it uses as much as digits as its factorization.

1678748896655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335749779336.

The product of its digits is 4877107200, while the sum is 80.

The spelling of 1678748896655 in words is "one trillion, six hundred seventy-eight billion, seven hundred forty-eight million, eight hundred ninety-six thousand, six hundred fifty-five".