678245909542877 has 32 divisors (see below), whose sum is σ = 737691736320000. Its totient is φ = 619862456041920.

The previous prime is 678245909542847. The next prime is 678245909542973. The reversal of 678245909542877 is 778245909542876.

It is a happy number.

It is not a de Polignac number, because 678245909542877 - 2¹⁰ = 678245909541853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678245909542795 and 678245909542804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678245909542807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1610522624 + ... + 1610943702.

It is an arithmetic number, because the mean of its divisors is an integer number (23052866760000).

Almost surely, 2^{678245909542877} is an apocalyptic number.

It is an amenable number.

678245909542877 is a deficient number, since it is larger than the sum of its proper divisors (59445826777123).

678245909542877 is a wasteful number, since it uses less digits than its factorization.

678245909542877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423401.

The product of its (nonzero) digits is 17069875200, while the sum is 83.

Subtracting 678245909542877 from its reverse (778245909542876), we obtain a palindrome (99999999999999).

The spelling of 678245909542877 in words is "six hundred seventy-eight trillion, two hundred forty-five billion, nine hundred nine million, five hundred forty-two thousand, eight hundred seventy-seven".