551106661 has 8 divisors (see below), whose sum is σ = 630188480. Its totient is φ = 472112928.

The previous prime is 551106659. The next prime is 551106679. The reversal of 551106661 is 166601155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551106661 - 2¹ = 551106659 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 (551106961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8016 + ... + 34153.

It is an arithmetic number, because the mean of its divisors is an integer number (78773560).

Almost surely, 2^551106661 is an apocalyptic number.

It is an amenable number.

551106661 is a deficient number, since it is larger than the sum of its proper divisors (79081819).

551106661 is a wasteful number, since it uses less digits than its factorization.

551106661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44043.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 551106661 is about 23475.6610343564. The cubic root of 551106661 is about 819.8704242014.

The spelling of 551106661 in words is "five hundred fifty-one million, one hundred six thousand, six hundred sixty-one".