611243253661 has 4 divisors (see below), whose sum is σ = 614314828000. Its totient is φ = 608171679324.

The previous prime is 611243253541. The next prime is 611243253713. The reversal of 611243253661 is 166352342116.

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 611243253661 - 2⁹ = 611243253149 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 (611243253961) 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, 1535786871 + ... + 1535787268.

It is an arithmetic number, because the mean of its divisors is an integer number (153578707000).

Almost surely, 2^611243253661 is an apocalyptic number.

It is an amenable number.

611243253661 is a deficient number, since it is larger than the sum of its proper divisors (3071574339).

611243253661 is a wasteful number, since it uses less digits than its factorization.

611243253661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071574338.

The product of its digits is 155520, while the sum is 40.

Adding to 611243253661 its reverse (166352342116), we get a palindrome (777595595777).

The spelling of 611243253661 in words is "six hundred eleven billion, two hundred forty-three million, two hundred fifty-three thousand, six hundred sixty-one".