55775827778 has 32 divisors (see below), whose sum is σ = 92186233920. Its totient is φ = 25098413760.

The previous prime is 55775827771. The next prime is 55775827787. The reversal of 55775827778 is 87772857755.

It is a super-2 number, since 2×55775827778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55775827771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2956925 + ... + 2975727.

It is an arithmetic number, because the mean of its divisors is an integer number (2880819810).

Almost surely, 2^55775827778 is an apocalyptic number.

55775827778 is a deficient number, since it is larger than the sum of its proper divisors (36410406142).

55775827778 is a wasteful number, since it uses less digits than its factorization.

55775827778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20162.

The product of its digits is 268912000, while the sum is 68.

The spelling of 55775827778 in words is "fifty-five billion, seven hundred seventy-five million, eight hundred twenty-seven thousand, seven hundred seventy-eight".