5555555505551 has 4 divisors (see below), whose sum is σ = 5734766973504. Its totient is φ = 5376344037600.

The previous prime is 5555555505541. The next prime is 5555555505557. The reversal of 5555555505551 is 1555055555555.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5555555505551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5555555505557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89605733930 + ... + 89605733991.

It is an arithmetic number, because the mean of its divisors is an integer number (1433691743376).

Almost surely, 2^{5555555505551} is an apocalyptic number.

5555555505551 is a deficient number, since it is larger than the sum of its proper divisors (179211467953).

5555555505551 is a wasteful number, since it uses less digits than its factorization.

5555555505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179211467952.

The product of its (nonzero) digits is 48828125, while the sum is 56.

The spelling of 5555555505551 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred five thousand, five hundred fifty-one".