978557303755878 has 64 divisors (see below), whose sum is σ = 2440042437611520. Its totient is φ = 254170369245600.

The previous prime is 978557303755873. The next prime is 978557303755921. The reversal of 978557303755878 is 878557303755879.

It is a junction number, because it is equal to n+sod(n) for n = 978557303755794 and 978557303755803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978557303755873) 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, 530476743 + ... + 532318221.

It is an arithmetic number, because the mean of its divisors is an integer number (38125663087680).

Almost surely, 2^{978557303755878} is an apocalyptic number.

978557303755878 is an abundant number, since it is smaller than the sum of its proper divisors (1461485133855642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978557303755878 is a wasteful number, since it uses less digits than its factorization.

978557303755878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991713.

The product of its (nonzero) digits is 62233920000, while the sum is 87.

Subtracting from 978557303755878 its reverse (878557303755879), we obtain a palindrome (99999999999999).

The spelling of 978557303755878 in words is "nine hundred seventy-eight trillion, five hundred fifty-seven billion, three hundred three million, seven hundred fifty-five thousand, eight hundred seventy-eight".