55556778400 has 36 divisors (see below), whose sum is σ = 135627987222. Its totient is φ = 22222711040.

The previous prime is 55556778383. The next prime is 55556778437. The reversal of 55556778400 is 487765555.

55556778400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 41425275024 + 14131503376 = 203532^2 + 118876^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34722187 + ... + 34723786.

Almost surely, 2^55556778400 is an apocalyptic number.

55556778400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55556778400 is an abundant number, since it is smaller than the sum of its proper divisors (80071208822).

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

55556778400 is a wasteful number, since it uses less digits than its factorization.

55556778400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69445993 (or 69445980 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 52.

The spelling of 55556778400 in words is "fifty-five billion, five hundred fifty-six million, seven hundred seventy-eight thousand, four hundred".