606111556661 has 4 divisors (see below), whose sum is σ = 652735522572. Its totient is φ = 559487590752.

The previous prime is 606111556619. The next prime is 606111556723. The reversal of 606111556661 is 166655111606.

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 184805412100 + 421306144561 = 429890^2 + 649081^2 .

It is a cyclic number.

It is not a de Polignac number, because 606111556661 - 2⁶ = 606111556597 is a prime.

It is a super-2 number, since 2×606111556661² (a number of 24 digits) contains 22 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 (606111556261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23311982936 + ... + 23311982961.

It is an arithmetic number, because the mean of its divisors is an integer number (163183880643).

Almost surely, 2^606111556661 is an apocalyptic number.

It is an amenable number.

606111556661 is a deficient number, since it is larger than the sum of its proper divisors (46623965911).

606111556661 is a wasteful number, since it uses less digits than its factorization.

606111556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46623965910.

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

The spelling of 606111556661 in words is "six hundred six billion, one hundred eleven million, five hundred fifty-six thousand, six hundred sixty-one".