678895116845 has 24 divisors (see below), whose sum is σ = 910148127000. Its totient is φ = 485647747200.

The previous prime is 678895116751. The next prime is 678895116859. The reversal of 678895116845 is 548611598876.

It can be written as a sum of positive squares in 4 ways, for example, as 29528356 + 678865588489 = 5434^2 + 823933^2 .

It is a de Polignac number, because none of the positive numbers 2^k-678895116845 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9160970 + ... + 9234779.

It is an arithmetic number, because the mean of its divisors is an integer number (37922838625).

Almost surely, 2^678895116845 is an apocalyptic number.

It is an amenable number.

678895116845 is a deficient number, since it is larger than the sum of its proper divisors (231253010155).

678895116845 is a wasteful number, since it uses less digits than its factorization.

678895116845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395837 (or 18395826 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 68.

The spelling of 678895116845 in words is "six hundred seventy-eight billion, eight hundred ninety-five million, one hundred sixteen thousand, eight hundred forty-five".