55278275778 has 48 divisors (see below), whose sum is σ = 131686603776. Its totient is φ = 16619087520.

The previous prime is 55278275747. The next prime is 55278275791. The reversal of 55278275778 is 87757287255.

55278275778 is a `hidden beast` number, since 5 + 52 + 7 + 8 + 2 + 7 + 577 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1074001 + ... + 1124292.

It is an arithmetic number, because the mean of its divisors is an integer number (2743470912).

Almost surely, 2^55278275778 is an apocalyptic number.

55278275778 is an abundant number, since it is smaller than the sum of its proper divisors (76408327998).

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

55278275778 is a wasteful number, since it uses less digits than its factorization.

55278275778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198439 (or 2198436 counting only the distinct ones).

The product of its digits is 76832000, while the sum is 63.

The spelling of 55278275778 in words is "fifty-five billion, two hundred seventy-eight million, two hundred seventy-five thousand, seven hundred seventy-eight".