474556661 has 4 divisors (see below), whose sum is σ = 475204812. Its totient is φ = 473908512.

The previous prime is 474556657. The next prime is 474556739. The reversal of 474556661 is 166655474.

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

It can be written as a sum of positive squares in 2 ways, for example, as 432889636 + 41667025 = 20806^2 + 6455^2 .

It is a cyclic number.

It is not a de Polignac number, because 474556661 - 2² = 474556657 is a prime.

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 (474556601) 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, 322976 + ... + 324441.

It is an arithmetic number, because the mean of its divisors is an integer number (118801203).

Almost surely, 2^474556661 is an apocalyptic number.

It is an amenable number.

474556661 is a deficient number, since it is larger than the sum of its proper divisors (648151).

474556661 is an equidigital number, since it uses as much as digits as its factorization.

474556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648150.

The product of its digits is 604800, while the sum is 44.

The square root of 474556661 is about 21784.3214491524. The cubic root of 474556661 is about 780.0025536844.

The spelling of 474556661 in words is "four hundred seventy-four million, five hundred fifty-six thousand, six hundred sixty-one".