678050139845 has 48 divisors (see below), whose sum is σ = 928644348240. Its totient is φ = 474325383168.

The previous prime is 678050139773. The next prime is 678050139869. The reversal of 678050139845 is 548931050876.

It is a Cunningham number, because it is equal to 823438²+1.

It can be written as a sum of positive squares in 24 ways, for example, as 415211408161 + 262838731684 = 644369^2 + 512678^2 .

It is not a de Polignac number, because 678050139845 - 2⁸ = 678050139589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1037729 + ... + 1559801.

It is an arithmetic number, because the mean of its divisors is an integer number (19346757255).

Almost surely, 2^678050139845 is an apocalyptic number.

678050139845 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

678050139845 is a deficient number, since it is larger than the sum of its proper divisors (250594208395).

678050139845 is a wasteful number, since it uses less digits than its factorization.

678050139845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522186 (or 522173 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 678050139845 in words is "six hundred seventy-eight billion, fifty million, one hundred thirty-nine thousand, eight hundred forty-five".