55605549978 has 32 divisors (see below), whose sum is σ = 134801334720. Its totient is φ = 16850166480.

The previous prime is 55605549949. The next prime is 55605549983. The reversal of 55605549978 is 87994550655.

55605549978 is a `hidden beast` number, since 5 + 5 + 6 + 0 + 554 + 9 + 9 + 78 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46805425 + ... + 46806612.

It is an arithmetic number, because the mean of its divisors is an integer number (4212541710).

Almost surely, 2^55605549978 is an apocalyptic number.

55605549978 is an abundant number, since it is smaller than the sum of its proper divisors (79195784742).

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

55605549978 is a wasteful number, since it uses less digits than its factorization.

55605549978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93612059 (or 93612053 counting only the distinct ones).

The product of its (nonzero) digits is 68040000, while the sum is 63.

The spelling of 55605549978 in words is "fifty-five billion, six hundred five million, five hundred forty-nine thousand, nine hundred seventy-eight".