55222943778 has 90 divisors (see below), whose sum is σ = 127430390241. Its totient is φ = 17874251856.

The previous prime is 55222943777. The next prime is 55222943819. The reversal of 55222943778 is 87734922255.

55222943778 is a `hidden beast` number, since 5 + 522 + 2 + 9 + 43 + 7 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44553499929 + 10669443849 = 211077^2 + 103293^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=166167.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (55222943777) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 110666973 + ... + 110667471.

Almost surely, 2^55222943778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55222943778

55222943778 is an abundant number, since it is smaller than the sum of its proper divisors (72207446463).

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

55222943778 is an frugal number, since it uses more digits than its factorization.

55222943778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 541 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 55222943778 in words is "fifty-five billion, two hundred twenty-two million, nine hundred forty-three thousand, seven hundred seventy-eight".