555948661 has 4 divisors (see below), whose sum is σ = 556536672. Its totient is φ = 555360652.

The previous prime is 555948623. The next prime is 555948713. The reversal of 555948661 is 166849555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166849555 = 5 ⋅33369911.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555948661 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555948611) 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 3 ways as a sum of consecutive naturals, for example, 292585 + ... + 294478.

It is an arithmetic number, because the mean of its divisors is an integer number (139134168).

Almost surely, 2^555948661 is an apocalyptic number.

It is an amenable number.

555948661 is a deficient number, since it is larger than the sum of its proper divisors (588011).

555948661 is an equidigital number, since it uses as much as digits as its factorization.

555948661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588010.

The product of its digits is 1296000, while the sum is 49.

The square root of 555948661 is about 23578.5635906855. The cubic root of 555948661 is about 822.2645420072.

The spelling of 555948661 in words is "five hundred fifty-five million, nine hundred forty-eight thousand, six hundred sixty-one".