55005555005551 has 8 divisors (see below), whose sum is σ = 55542520949760. Its totient is φ = 54468645435192.

The previous prime is 55005555005539. The next prime is 55005555005567. The reversal of 55005555005551 is 15550055550055.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55005555005551 - 2⁹ = 55005555005039 is a prime.

It is a super-2 number, since 2×55005555005551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005555003551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12131155 + ... + 16036708.

It is an arithmetic number, because the mean of its divisors is an integer number (6942815118720).

Almost surely, 2^{55005555005551} is an apocalyptic number.

55005555005551 is a deficient number, since it is larger than the sum of its proper divisors (536965944209).

55005555005551 is a wasteful number, since it uses less digits than its factorization.

55005555005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28186925.

The product of its (nonzero) digits is 1953125, while the sum is 46.

The spelling of 55005555005551 in words is "fifty-five trillion, five billion, five hundred fifty-five million, five thousand, five hundred fifty-one".