678193956945 has 12 divisors (see below), whose sum is σ = 1175536192116. Its totient is φ = 361703443680.

The previous prime is 678193956887. The next prime is 678193956977. The reversal of 678193956945 is 549659391876.

678193956945 is a `hidden beast` number, since 6 + 7 + 8 + 19 + 3 + 9 + 569 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 464447702016 + 213746254929 = 681504^2 + 462327^2 .

It is not a de Polignac number, because 678193956945 - 2¹¹ = 678193954897 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7535488366 + ... + 7535488455.

It is an arithmetic number, because the mean of its divisors is an integer number (97961349343).

Almost surely, 2^678193956945 is an apocalyptic number.

It is an amenable number.

678193956945 is a deficient number, since it is larger than the sum of its proper divisors (497342235171).

678193956945 is a wasteful number, since it uses less digits than its factorization.

678193956945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15070976832 (or 15070976829 counting only the distinct ones).

The product of its digits is 440899200, while the sum is 72.

The spelling of 678193956945 in words is "six hundred seventy-eight billion, one hundred ninety-three million, nine hundred fifty-six thousand, nine hundred forty-five".