546406661 has 4 divisors (see below), whose sum is σ = 565248300. Its totient is φ = 527565024.

The previous prime is 546406649. The next prime is 546406687. The reversal of 546406661 is 166604645.

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 94206436 + 452200225 = 9706^2 + 21265^2 .

It is a cyclic number.

It is not a de Polignac number, because 546406661 - 2¹⁰ = 546405637 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 (546406261) 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, 9420776 + ... + 9420833.

It is an arithmetic number, because the mean of its divisors is an integer number (141312075).

Almost surely, 2^546406661 is an apocalyptic number.

It is an amenable number.

546406661 is a deficient number, since it is larger than the sum of its proper divisors (18841639).

546406661 is a wasteful number, since it uses less digits than its factorization.

546406661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18841638.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 546406661 is about 23375.3430135260. The cubic root of 546406661 is about 817.5330681446.

The spelling of 546406661 in words is "five hundred forty-six million, four hundred six thousand, six hundred sixty-one".