555605661 has 8 divisors (see below), whose sum is σ = 797792800. Its totient is φ = 341911152.

The previous prime is 555605639. The next prime is 555605663. The reversal of 555605661 is 166506555.

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

It is not a de Polignac number, because 555605661 - 2⁶ = 555605597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 14246299 = 555605661 / (5 + 5 + 5 + 6 + 0 + 5 + 6 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555605663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7123111 + ... + 7123188.

It is an arithmetic number, because the mean of its divisors is an integer number (99724100).

Almost surely, 2^555605661 is an apocalyptic number.

It is an amenable number.

555605661 is a deficient number, since it is larger than the sum of its proper divisors (242187139).

555605661 is a wasteful number, since it uses less digits than its factorization.

555605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14246315.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 555605661 is about 23571.2889125733. The cubic root of 555605661 is about 822.0954048310.

The spelling of 555605661 in words is "five hundred fifty-five million, six hundred five thousand, six hundred sixty-one".