551665606550 has 24 divisors (see below), whose sum is σ = 1061480721600. Its totient is φ = 213057061280.

The previous prime is 551665606549. The next prime is 551665606553. The reversal of 551665606550 is 55606566155.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551665606553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 190228070 + ... + 190230969.

It is an arithmetic number, because the mean of its divisors is an integer number (44228363400).

Almost surely, 2^551665606550 is an apocalyptic number.

551665606550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

551665606550 is a deficient number, since it is larger than the sum of its proper divisors (509815115050).

551665606550 is a wasteful number, since it uses less digits than its factorization.

551665606550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380459080 (or 380459075 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 551665606550 in words is "five hundred fifty-one billion, six hundred sixty-five million, six hundred six thousand, five hundred fifty".