55678319978 has 12 divisors (see below), whose sum is σ = 86298502050. Its totient is φ = 26941121640.

The previous prime is 55678319971. The next prime is 55678319999. The reversal of 55678319978 is 87991387655.

It can be written as a sum of positive squares in only one way, i.e., 28408091209 + 27270228769 = 168547^2 + 165137^2 .

It is not an unprimeable number, because it can be changed into a prime (55678319971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14482553 + ... + 14486396.

Almost surely, 2^55678319978 is an apocalyptic number.

55678319978 is a deficient number, since it is larger than the sum of its proper divisors (30620182072).

55678319978 is a wasteful number, since it uses less digits than its factorization.

55678319978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28969013 (or 28968982 counting only the distinct ones).

The product of its digits is 114307200, while the sum is 68.

The spelling of 55678319978 in words is "fifty-five billion, six hundred seventy-eight million, three hundred nineteen thousand, nine hundred seventy-eight".