55555611055551 has 12 divisors (see below), whose sum is σ = 81026090774928. Its totient is φ = 36677490793344.

The previous prime is 55555611055501. The next prime is 55555611055577. The reversal of 55555611055551 is 15555011655555.

It is not a de Polignac number, because 55555611055551 - 2¹⁸ = 55555610793407 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555611055501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29965269330 + ... + 29965271183.

It is an arithmetic number, because the mean of its divisors is an integer number (6752174231244).

Almost surely, 2^{55555611055551} is an apocalyptic number.

55555611055551 is a deficient number, since it is larger than the sum of its proper divisors (25470479719377).

55555611055551 is a wasteful number, since it uses less digits than its factorization.

55555611055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59930540622 (or 59930540619 counting only the distinct ones).

The product of its (nonzero) digits is 11718750, while the sum is 54.

The spelling of 55555611055551 in words is "fifty-five trillion, five hundred fifty-five billion, six hundred eleven million, fifty-five thousand, five hundred fifty-one".