611606206661 has 4 divisors (see below), whose sum is σ = 611607771072. Its totient is φ = 611604642252.

The previous prime is 611606206637. The next prime is 611606206667. The reversal of 611606206661 is 166602606116.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 611606206661 - 2¹⁴ = 611606190277 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 (611606206667) 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, 367940 + ... + 1165586.

It is an arithmetic number, because the mean of its divisors is an integer number (152901942768).

Almost surely, 2^611606206661 is an apocalyptic number.

It is an amenable number.

611606206661 is a deficient number, since it is larger than the sum of its proper divisors (1564411).

611606206661 is an equidigital number, since it uses as much as digits as its factorization.

611606206661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564410.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 611606206661 in words is "six hundred eleven billion, six hundred six million, two hundred six thousand, six hundred sixty-one".