55778221577088 has 48 divisors (see below), whose sum is σ = 160507642822800. Its totient is φ = 18592740525312.

The previous prime is 55778221577077. The next prime is 55778221577093. The reversal of 55778221577088 is 88077512287755.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×55778221577088² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

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, 24209296408 + ... + 24209298711.

It is an arithmetic number, because the mean of its divisors is an integer number (3343909225475).

Almost surely, 2^{55778221577088} is an apocalyptic number.

It is an amenable number.

55778221577088 is an abundant number, since it is smaller than the sum of its proper divisors (104729421245712).

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

55778221577088 is a wasteful number, since it uses less digits than its factorization.

55778221577088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48418595139 (or 48418595124 counting only the distinct ones).

The product of its (nonzero) digits is 614656000, while the sum is 72.

The spelling of 55778221577088 in words is "fifty-five trillion, seven hundred seventy-eight billion, two hundred twenty-one million, five hundred seventy-seven thousand, eighty-eight".