655550551 has 4 divisors (see below), whose sum is σ = 655614504. Its totient is φ = 655486600.

The previous prime is 655550543. The next prime is 655550557. The reversal of 655550551 is 155055556.

655550551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 655550551 - 2³ = 655550543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655550551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655550557) 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, 12745 + ... + 38386.

It is an arithmetic number, because the mean of its divisors is an integer number (163903626).

Almost surely, 2^655550551 is an apocalyptic number.

655550551 is a deficient number, since it is larger than the sum of its proper divisors (63953).

655550551 is a wasteful number, since it uses less digits than its factorization.

655550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63952.

The product of its (nonzero) digits is 93750, while the sum is 37.

The square root of 655550551 is about 25603.7214287298. The cubic root of 655550551 is about 868.6978145352.

It can be divided in two parts, 6555505 and 51, that added together give a palindrome (6555556).

The spelling of 655550551 in words is "six hundred fifty-five million, five hundred fifty thousand, five hundred fifty-one".