606511561661 has 8 divisors (see below), whose sum is σ = 614870154360. Its totient is φ = 598154326272.

The previous prime is 606511561637. The next prime is 606511561757. The reversal of 606511561661 is 166165115606.

It can be written as a sum of positive squares in 4 ways, for example, as 19861264900 + 586650296761 = 140930^2 + 765931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 606511561661 - 2³⁸ = 331633654717 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 (606511561361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577475 + ... + 1243583.

It is an arithmetic number, because the mean of its divisors is an integer number (76858769295).

Almost surely, 2^606511561661 is an apocalyptic number.

It is an amenable number.

606511561661 is a deficient number, since it is larger than the sum of its proper divisors (8358592699).

606511561661 is a wasteful number, since it uses less digits than its factorization.

606511561661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678655.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 606511561661 in words is "six hundred six billion, five hundred eleven million, five hundred sixty-one thousand, six hundred sixty-one".