55504972278 has 256 divisors, whose sum is σ = 147172147200. Its totient is φ = 15180929280.

The previous prime is 55504972267. The next prime is 55504972291. The reversal of 55504972278 is 87227940555.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 167688573 + ... + 167688903.

It is an arithmetic number, because the mean of its divisors is an integer number (574891200).

Almost surely, 2^55504972278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55504972278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73586073600).

55504972278 is an abundant number, since it is smaller than the sum of its proper divisors (91667174922).

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

55504972278 is a wasteful number, since it uses less digits than its factorization.

55504972278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 7056000, while the sum is 54.

The spelling of 55504972278 in words is "fifty-five billion, five hundred four million, nine hundred seventy-two thousand, two hundred seventy-eight".