655555554444444 has 72 divisors (see below), whose sum is σ = 1604971154157840. Its totient is φ = 208240694948352.

The previous prime is 655555554444403. The next prime is 655555554444503. The reversal of 655555554444444 is 444444455555556.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190243357 + ... + 193658580.

It is an arithmetic number, because the mean of its divisors is an integer number (22291266029970).

Almost surely, 2^{655555554444444} is an apocalyptic number.

It is an amenable number.

655555554444444 is an abundant number, since it is smaller than the sum of its proper divisors (949415599713396).

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

655555554444444 is a wasteful number, since it uses less digits than its factorization.

655555554444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383902259 (or 383902234 counting only the distinct ones).

The product of its digits is 7680000000, while the sum is 69.

The spelling of 655555554444444 in words is "six hundred fifty-five trillion, five hundred fifty-five billion, five hundred fifty-four million, four hundred forty-four thousand, four hundred forty-four".