55255057578 has 128 divisors (see below), whose sum is σ = 141974208000. Its totient is φ = 15602803200.

The previous prime is 55255057567. The next prime is 55255057579. The reversal of 55255057578 is 87575055255.

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 (55255057579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30885108 + ... + 30886896.

It is an arithmetic number, because the mean of its divisors is an integer number (1109173500).

Almost surely, 2^55255057578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55255057578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70987104000).

55255057578 is an abundant number, since it is smaller than the sum of its proper divisors (86719150422).

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

55255057578 is a wasteful number, since it uses less digits than its factorization.

55255057578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717 (or 2711 counting only the distinct ones).

The product of its (nonzero) digits is 12250000, while the sum is 54.

The spelling of 55255057578 in words is "fifty-five billion, two hundred fifty-five million, fifty-seven thousand, five hundred seventy-eight".