1678693812956 has 6 divisors (see below), whose sum is σ = 2937714172680. Its totient is φ = 839346906476.

The previous prime is 1678693812953. The next prime is 1678693812973. The reversal of 1678693812956 is 6592183968761.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1678693812956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678693812953) 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 as a sum of consecutive naturals, namely, 209836726616 + ... + 209836726623.

It is an arithmetic number, because the mean of its divisors is an integer number (489619028780).

Almost surely, 2^{1678693812956} is an apocalyptic number.

It is an amenable number.

1678693812956 is a deficient number, since it is larger than the sum of its proper divisors (1259020359724).

1678693812956 is a wasteful number, since it uses less digits than its factorization.

1678693812956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419673453243 (or 419673453241 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 71.

The spelling of 1678693812956 in words is "one trillion, six hundred seventy-eight billion, six hundred ninety-three million, eight hundred twelve thousand, nine hundred fifty-six".