505556055551 has 4 divisors (see below), whose sum is σ = 535294647072. Its totient is φ = 475817464032.

The previous prime is 505556055547. The next prime is 505556055577. The reversal of 505556055551 is 155550655505.

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

It is a cyclic number.

It is not a de Polignac number, because 505556055551 - 2² = 505556055547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505556055496 and 505556055505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505556055581) 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, 14869295735 + ... + 14869295768.

It is an arithmetic number, because the mean of its divisors is an integer number (133823661768).

Almost surely, 2^505556055551 is an apocalyptic number.

505556055551 is a deficient number, since it is larger than the sum of its proper divisors (29738591521).

505556055551 is a wasteful number, since it uses less digits than its factorization.

505556055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29738591520.

The product of its (nonzero) digits is 2343750, while the sum is 47.

The spelling of 505556055551 in words is "five hundred five billion, five hundred fifty-six million, fifty-five thousand, five hundred fifty-one".