1678047705281 has 4 divisors (see below), whose sum is σ = 1678198660692. Its totient is φ = 1677896749872.

The previous prime is 1678047705259. The next prime is 1678047705421. The reversal of 1678047705281 is 1825077408761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 951436373056 + 726611332225 = 975416^2 + 852415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678047705281 - 2¹⁰ = 1678047704257 is a prime.

It is a super-2 number, since 2×1678047705281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678047705241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75461030 + ... + 75483263.

It is an arithmetic number, because the mean of its divisors is an integer number (419549665173).

Almost surely, 2^{1678047705281} is an apocalyptic number.

It is an amenable number.

1678047705281 is a deficient number, since it is larger than the sum of its proper divisors (150955411).

1678047705281 is a wasteful number, since it uses less digits than its factorization.

1678047705281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150955410.

The product of its (nonzero) digits is 5268480, while the sum is 56.

The spelling of 1678047705281 in words is "one trillion, six hundred seventy-eight billion, forty-seven million, seven hundred five thousand, two hundred eighty-one".