556750661 has 4 divisors (see below), whose sum is σ = 561677772. Its totient is φ = 551823552.

The previous prime is 556750657. The next prime is 556750687. The reversal of 556750661 is 166057655.

556750661 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 an emirpimes, since its reverse is a distinct semiprime: 166057655 = 5 ⋅33211531.

It can be written as a sum of positive squares in 2 ways, for example, as 5909761 + 550840900 = 2431^2 + 23470^2 .

It is a cyclic number.

It is not a de Polignac number, because 556750661 - 2² = 556750657 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 (556750361) 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, 2463386 + ... + 2463611.

It is an arithmetic number, because the mean of its divisors is an integer number (140419443).

Almost surely, 2^556750661 is an apocalyptic number.

It is an amenable number.

556750661 is a deficient number, since it is larger than the sum of its proper divisors (4927111).

556750661 is a wasteful number, since it uses less digits than its factorization.

556750661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927110.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 556750661 is about 23595.5644348678. The cubic root of 556750661 is about 822.6597459513.

The spelling of 556750661 in words is "five hundred fifty-six million, seven hundred fifty thousand, six hundred sixty-one".