606661661 has 4 divisors (see below), whose sum is σ = 626231424. Its totient is φ = 587091900.

The previous prime is 606661637. The next prime is 606661663. The reversal of 606661661 is 166166606.

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.

It is a cyclic number.

It is not a de Polignac number, because 606661661 - 2⁶ = 606661597 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 (606661663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9784835 + ... + 9784896.

It is an arithmetic number, because the mean of its divisors is an integer number (156557856).

Almost surely, 2^606661661 is an apocalyptic number.

It is an amenable number.

606661661 is a deficient number, since it is larger than the sum of its proper divisors (19569763).

606661661 is a wasteful number, since it uses less digits than its factorization.

606661661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19569762.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 606661661 is about 24630.5026542294. The cubic root of 606661661 is about 846.5426628451.

The spelling of 606661661 in words is "six hundred six million, six hundred sixty-one thousand, six hundred sixty-one".