555661066 has 4 divisors (see below), whose sum is σ = 833491602. Its totient is φ = 277830532.

The previous prime is 555661033. The next prime is 555661091. The reversal of 555661066 is 660166555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 367834041 + 187827025 = 19179^2 + 13705^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138915265 + ... + 138915268.

Almost surely, 2^555661066 is an apocalyptic number.

555661066 is a deficient number, since it is larger than the sum of its proper divisors (277830536).

555661066 is a wasteful number, since it uses less digits than its factorization.

555661066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277830535.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 555661066 is about 23572.4641478145. The cubic root of 555661066 is about 822.1227303756.

The spelling of 555661066 in words is "five hundred fifty-five million, six hundred sixty-one thousand, sixty-six".