54639591978 has 16 divisors (see below), whose sum is σ = 110818328256. Its totient is φ = 17956673280.

The previous prime is 54639591967. The next prime is 54639591997. The reversal of 54639591978 is 87919593645.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64130551 + ... + 64131402.

It is an arithmetic number, because the mean of its divisors is an integer number (6926145516).

Almost surely, 2^54639591978 is an apocalyptic number.

54639591978 is an abundant number, since it is smaller than the sum of its proper divisors (56178736278).

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

54639591978 is a wasteful number, since it uses less digits than its factorization.

54639591978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128262029.

The product of its digits is 73483200, while the sum is 66.

The spelling of 54639591978 in words is "fifty-four billion, six hundred thirty-nine million, five hundred ninety-one thousand, nine hundred seventy-eight".