555471661 has 4 divisors (see below), whose sum is σ = 559468000. Its totient is φ = 551475324.

The previous prime is 555471647. The next prime is 555471677. The reversal of 555471661 is 166174555.

555471661 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166174555 = 5 ⋅33234911.

It is a cyclic number.

It is not a de Polignac number, because 555471661 - 2⁷ = 555471533 is a prime.

It is a super-3 number, since 3×555471661³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555471601) 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, 1997961 + ... + 1998238.

It is an arithmetic number, because the mean of its divisors is an integer number (139867000).

Almost surely, 2^555471661 is an apocalyptic number.

It is an amenable number.

555471661 is a deficient number, since it is larger than the sum of its proper divisors (3996339).

555471661 is a wasteful number, since it uses less digits than its factorization.

555471661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996338.

The product of its digits is 126000, while the sum is 40.

The square root of 555471661 is about 23568.4463000852. The cubic root of 555471661 is about 822.0293090072.

The spelling of 555471661 in words is "five hundred fifty-five million, four hundred seventy-one thousand, six hundred sixty-one".