5551044401555 has 4 divisors (see below), whose sum is σ = 6661253281872. Its totient is φ = 4440835521240.

The previous prime is 5551044401537. The next prime is 5551044401561.

5551044401555 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 5551044401555 - 2²⁰ = 5551043352979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 555104440151 + ... + 555104440160.

It is an arithmetic number, because the mean of its divisors is an integer number (1665313320468).

Almost surely, 2^{5551044401555} is an apocalyptic number.

5551044401555 is a deficient number, since it is larger than the sum of its proper divisors (1110208880317).

5551044401555 is a wasteful number, since it uses less digits than its factorization.

5551044401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110208880316.

The product of its (nonzero) digits is 1000000, while the sum is 44.

Adding to 5551044401555 its product of nonzero digits (1000000), we get a palindrome (5551045401555).

Subtracting from 5551044401555 its product of nonzero digits (1000000), we obtain a palindrome (5551043401555).

The spelling of 5551044401555 in words is "five trillion, five hundred fifty-one billion, forty-four million, four hundred one thousand, five hundred fifty-five".